10 Megapixel SLRs Compared (continued)
HIGH ISO NOISE: From brief comparisons the Pentax and Canon XTi are the best at controlling noise at high ISO ("film") speeds. However, they approach noise reduction in very different manners. The Pentax retains edge sharpness, dynamic range and contrast at high ISO but allows the background to become grainier; the Canon reduces edge sharpness, contrast, and dynamic range to make noise less noticeable at high ISO. Since dynamic range - the range from lightest to darkest - is already a problem with all digital photography we prefer noise control that preserves the already limited dynamic range as much as possible, but some will prefer the Canon approach. Both are followed closely by the Nikon, with the Sony exhibiting the most noise at high ISO. All four are all but identical to ISO 400, but at 800 small differences start to appear. It is worth noting that while the Pentax and the Canon sensors/processors control noise well they are not as "noise-free" as the Canon 6 megapixel and 8 megapixel CMOS sensors. This should not really be a surprise since the size of the sensor is the same APS C size in the 6, 8, and 10 megapixel versions. More pixels in the same area therefore translates into a bit more noise.
KIT LENS: While you can always upgrade to a better lens, the kit lenses that are normally packaged with the SLR are normally very good value for your money. The bare entry level lens for the Canon, Nikon, and Pentax SLRs is an 18-55mm, which is equivalent to a 28mm to 80mm lens on a traditional 35mm camera. The Sony normal lens is 18-70mm, adds the same cost to the kit as the others, but is equivalent to a 28-105mm lens for 35mm. Build quality is usually cheap on kit lenses, but the above picture compares the Sony and Pentax kit lenses. It is worth pointing out that the Pentax 18-55mm is the only kit lens with a metal lens mount as normally seen on "better" lenses - the others all have a plastic lens mount. Nikon actually has two other kit lenses in the 18-70mm and 18-135mm lenses, but these "kit" lenses add as much as $300 to the kit total, compared to an average $100 or less for the other kit lenses.
BUILD QUALITY: By far, the Pentax K10D feels the most solid and it is the heaviest of the four cameras. That can be good (build quality) or bad (increased weight) depending on your desires. The Nikon D80 is a very solid piece of equipment and is the easy number 2, followed closely by the also solid Sony A100. The extra sealing for water/dust resistance pays off in the K10D, which is easily the best quality Pentax since the *ist D, which also had a solid build quality. The Nikon and Sony build quality are about the same, except for the Sony's loud slapping mirror and louder focusing. The Canon is far behind the other three in build quality, but it still has the quietest lenses of the group with the integrated lens focusing motors. The damped mirror sound on the Pentax is very reassuring to most ears.
FLASH: Nikon and Sony (inherited from Minolta) both provide excellent distance integration in their flash offering. With Nikon D and Sony/Maxxum ADI lenses, flash photography is accurate and predictable. Pentax and Canon also have good built-in flashes and external flash units, but they are not quite the equal of the D offerings. Nikon has reasonable pricing for flashes, but Sony decided to make their Sony/Minolta flash units very expensive.
LCD(s): All four 10 megapixel cameras offer large 2.5" color preview screens. The Sony and Canon also use the screen for menus, while the Pentax and Nikon have a separate top-deck LCD that provides info on camera settings.
CONTROL: The Pentax Hyperprogram has been around for quite a while, and Pentax did a really great job with the front/rear dials and new sensitivity program line. The Nikon D80 also has both front and rear control dials, while the Sony and Canon have just one control dial. The ability of the Pentax to shift the program aperture with one dial and the shutter speed with the other while the camera is still in program mode makes shooting like you want a lot easier - the creative control of manual while still in program mode.
AUTO ISO: Both the Pentax and Nikon offer user selectable Auto ISO ranges - a really useful feature where the camera automatically selects "speed" based on program conditions you can manually set. Sony also offers Auto ISO, but it is limited to ISO 400 and it is not user programmable. The K10D capabilities with a manual, non-autofocus K-mount lens are icing on the cake - you can even use effective anti-shake with manual lenses after dialing in the focal length. Newer lenses automatically provide the focal length info to the camera.
PRICE: Amazon and Newegg were used to determine online prices. These prices should be available to any online shopper, but you may find even better prices if you are willing to do more searching. Conversely, local photo specialty retailers normally provide better customer support and return options than etailers, and their prices for the same item will generally be higher due to the extra service they provide. Right now the Sony A100 is the best value available with a price with 18-70mm lens of about $720. The Canon XTi is selling for about $800 with an 18-55mm lens. The moisture and dust sealed Pentax K10D with a quality 18-55 lens is $999, and the Nikon D80 with an 18-55 lens is about $1100.
Recommendations
All-in-all the Nikon D80 and Pentax K10D are the closest in build quality and depth of features. When you consider the K10D has very effective anti-shake built in, effective moisture sealing, and dust removal - and the Nikon has none of these features - the advantage definitely goes to Pentax. If you are a serious photographer you will be very happy with the Pentax K10D. If you are already committed to the Canon or Nikon lens system, then your choice is easier. However, while Canon pioneered the under $1000 digital camera market, the Canon Rebel XTi is by far the worst offering in the 10 megapixel range. It is cheaply built with poor ergonomics compared to other 10 megapixel offerings.
The Sony A100 is by far the best buy in the 10 megapixel group. Sony has reduced the suggested retail price for the kit to $899 - the same as the Canon Rebel XTi with lens. However, you can actually buy the Sony A100 for a lot less. At $720 the A100 offers a longer 18-70 lens, excellent build quality, anti-shake for any lens, compatibility with new Sony lenses and most any Minolta Maxxum lens, enhanced dynamic range, and fast operation.
HIGH ISO NOISE: From brief comparisons the Pentax and Canon XTi are the best at controlling noise at high ISO ("film") speeds. However, they approach noise reduction in very different manners. The Pentax retains edge sharpness, dynamic range and contrast at high ISO but allows the background to become grainier; the Canon reduces edge sharpness, contrast, and dynamic range to make noise less noticeable at high ISO. Since dynamic range - the range from lightest to darkest - is already a problem with all digital photography we prefer noise control that preserves the already limited dynamic range as much as possible, but some will prefer the Canon approach. Both are followed closely by the Nikon, with the Sony exhibiting the most noise at high ISO. All four are all but identical to ISO 400, but at 800 small differences start to appear. It is worth noting that while the Pentax and the Canon sensors/processors control noise well they are not as "noise-free" as the Canon 6 megapixel and 8 megapixel CMOS sensors. This should not really be a surprise since the size of the sensor is the same APS C size in the 6, 8, and 10 megapixel versions. More pixels in the same area therefore translates into a bit more noise.
KIT LENS: While you can always upgrade to a better lens, the kit lenses that are normally packaged with the SLR are normally very good value for your money. The bare entry level lens for the Canon, Nikon, and Pentax SLRs is an 18-55mm, which is equivalent to a 28mm to 80mm lens on a traditional 35mm camera. The Sony normal lens is 18-70mm, adds the same cost to the kit as the others, but is equivalent to a 28-105mm lens for 35mm. Build quality is usually cheap on kit lenses, but the above picture compares the Sony and Pentax kit lenses. It is worth pointing out that the Pentax 18-55mm is the only kit lens with a metal lens mount as normally seen on "better" lenses - the others all have a plastic lens mount. Nikon actually has two other kit lenses in the 18-70mm and 18-135mm lenses, but these "kit" lenses add as much as $300 to the kit total, compared to an average $100 or less for the other kit lenses.
BUILD QUALITY: By far, the Pentax K10D feels the most solid and it is the heaviest of the four cameras. That can be good (build quality) or bad (increased weight) depending on your desires. The Nikon D80 is a very solid piece of equipment and is the easy number 2, followed closely by the also solid Sony A100. The extra sealing for water/dust resistance pays off in the K10D, which is easily the best quality Pentax since the *ist D, which also had a solid build quality. The Nikon and Sony build quality are about the same, except for the Sony's loud slapping mirror and louder focusing. The Canon is far behind the other three in build quality, but it still has the quietest lenses of the group with the integrated lens focusing motors. The damped mirror sound on the Pentax is very reassuring to most ears.
FLASH: Nikon and Sony (inherited from Minolta) both provide excellent distance integration in their flash offering. With Nikon D and Sony/Maxxum ADI lenses, flash photography is accurate and predictable. Pentax and Canon also have good built-in flashes and external flash units, but they are not quite the equal of the D offerings. Nikon has reasonable pricing for flashes, but Sony decided to make their Sony/Minolta flash units very expensive.
LCD(s): All four 10 megapixel cameras offer large 2.5" color preview screens. The Sony and Canon also use the screen for menus, while the Pentax and Nikon have a separate top-deck LCD that provides info on camera settings.
CONTROL: The Pentax Hyperprogram has been around for quite a while, and Pentax did a really great job with the front/rear dials and new sensitivity program line. The Nikon D80 also has both front and rear control dials, while the Sony and Canon have just one control dial. The ability of the Pentax to shift the program aperture with one dial and the shutter speed with the other while the camera is still in program mode makes shooting like you want a lot easier - the creative control of manual while still in program mode.
AUTO ISO: Both the Pentax and Nikon offer user selectable Auto ISO ranges - a really useful feature where the camera automatically selects "speed" based on program conditions you can manually set. Sony also offers Auto ISO, but it is limited to ISO 400 and it is not user programmable. The K10D capabilities with a manual, non-autofocus K-mount lens are icing on the cake - you can even use effective anti-shake with manual lenses after dialing in the focal length. Newer lenses automatically provide the focal length info to the camera.
PRICE: Amazon and Newegg were used to determine online prices. These prices should be available to any online shopper, but you may find even better prices if you are willing to do more searching. Conversely, local photo specialty retailers normally provide better customer support and return options than etailers, and their prices for the same item will generally be higher due to the extra service they provide. Right now the Sony A100 is the best value available with a price with 18-70mm lens of about $720. The Canon XTi is selling for about $800 with an 18-55mm lens. The moisture and dust sealed Pentax K10D with a quality 18-55 lens is $999, and the Nikon D80 with an 18-55 lens is about $1100.
Recommendations
All-in-all the Nikon D80 and Pentax K10D are the closest in build quality and depth of features. When you consider the K10D has very effective anti-shake built in, effective moisture sealing, and dust removal - and the Nikon has none of these features - the advantage definitely goes to Pentax. If you are a serious photographer you will be very happy with the Pentax K10D. If you are already committed to the Canon or Nikon lens system, then your choice is easier. However, while Canon pioneered the under $1000 digital camera market, the Canon Rebel XTi is by far the worst offering in the 10 megapixel range. It is cheaply built with poor ergonomics compared to other 10 megapixel offerings.
The Sony A100 is by far the best buy in the 10 megapixel group. Sony has reduced the suggested retail price for the kit to $899 - the same as the Canon Rebel XTi with lens. However, you can actually buy the Sony A100 for a lot less. At $720 the A100 offers a longer 18-70 lens, excellent build quality, anti-shake for any lens, compatibility with new Sony lenses and most any Minolta Maxxum lens, enhanced dynamic range, and fast operation.
Facebook
Twitter
RSS
89 Comments
View All Comments
astroidea - Sunday, December 31, 2006 - link
You still don't seem to get it.This article isn't about rating lenses or what is the best DSLR to get if you have $2000 to spend. It's to talk about the latest released bodies in the sub $1000 sector, NOT the professional sector.
Just because Canon/Nikon makes multithousand dollar professional equipment, it doesn't mean their consumer product line is the best too.
And as for the 50mm MK1 not being an L, there has been many canon owners that owned the Canon 50mm F/1.0 L and the Pentax 50mm F/1.4, and just about everyone of them will tell you the latter is better.
Many photography review sites tested the 200mm macros, and have all concluded that the Pentax FA* 200mm F/4 macro is the best they've ever seen.
The Pentax DA 14mm F/2.8 is rated to be better than both Nikon and Canon versions, and costs half the price(due to being APS cropped).
Sigma has many lenses that are better than Canon/Nikon's too. All makers have their gems and their dogs. Don't be silly.
Again, if you don't even have the slightest clue about the pentax lenses you are talking about, don't come up with ignorant assumptions.
And you must have some insane brand loyalty if you found wesley's article to be anti-nikon, when he placed their camera has #2 best choice.
Only Canon's was placed last, and deservedly so with the poor viewfinder and flimsy construction. Now don't tell me you're blind enough to defend Canon's subpar build too?
Justin Case - Sunday, December 31, 2006 - link
No, the article is, according to its own author, "not a review of the cameras", it is "a buyer's guide".A "buyer's guide" for SLR cameras must take into account the fundamental difference between SLRs and compact cameras. When you buy an SLR, you do it for the lenses and accessories. Either that or you're a masochist, because SLRs are more expensive, heavier, bigger and harder to use than compacts (and that's why even pro photographers with a ton of high-end equipment often carry around a small P&S).
The only other reason to use an SLR would be speed (faster power-up, faster shooting, etc., so you don't miss any good shots). But, guess what, the "article" doesn't cover that, either.
As to your claims that certain lenses have been very higly "rated", could you post some links or references? To tests with actual images? That's another thing this "buyer's guide" is missing: comparative photos taken with each camera. I guess that's an insignificant detail when comparing cameras, what really matters is the spec sheets and which one is 10% cheaper... sigh...
As to Sigma, they have a couple of lenses that are indeed better than the equivalent ones made by Canon or Nikon (although, to be honest, that's only because both Canon and Nikon have pretty crappy lenses for some focal lengths)... Anyway, Sigma sells nearly all of them in Canon and Nikon mounts, so if you have a Canon or Nikon camera, you have access to pretty much any Sigma model. And that goes for most manufacturers.
Sigma lenses with EOS mounts are part of Canon users' lens selection. As are Tokina or Tamron (or Leica) lenses with EOS mounts. In fact, you can even put Pentax M42 lenses on an EOS camera (but not the other way around). How's that for lens selection?
I'll be the first to agree that both Canon and Nikon have some real stinkers (as does ever manufacturer). But that's not the point. You don't have to buy the stinkers. The point is that when you pick a Canon or Nikon SLR, you have access to pretty much any lens out there. And that particular point (which is a fundamental one when it comes to SLRs) was completely distorted in this "buyer's guide". Maybe this was "Pentax fanboyism", as some people have suggested above, but personally I think it was just ignorance or lack of experience.
And that is why I suggest that anyone who wants to buy an SLR spend some time reading articles in photography sites, first to understand the difference between SLRs and compact cameras, and then to understand what are the ascpects of SLRs that they should be comparing, depending on what they are planning to do with them.
P.S. - I don't like the Rebel XTi, as I mentioned on another post above, and I'd never buy one, mainly due to ergonomics. But it has the best overall image quality of the four cameras tested here, and by far the best lens selection on the tele end.
astroidea - Monday, January 1, 2007 - link
Ok, so you like to tout your high and mighty canon/nikon lens selection.They do have very amazing lenses for professionals that Pentax lacks and dozens of lenses overlapping the same focal range.
However, as of March 2007, they will come out with their own line of DA* lenses, that will directly compete with Canon/Nikon's professional like. They will have the quick focusing USM motors, weather sealing, very high optical quality, and fast apertures.
http://www.dpreview.com/news/0609/06092102pentaxda...">http://www.dpreview.com/news/0609/06092102pentaxda...
This will fulfill pentax's most lacking sector in their lenses.
Now, with the introduction of these lenses, tell me what part of Pentax's lens selection is lacking, that a user will find themselves starving of lens choice?
Pentax may not have a dozen lenses that overlap the same focal range, but they are certainly adequate in covering their bases. Does that make them inferior? Does the lack of dozens of lenses that overlap the same focal range make pentax an unworthy competitor?
I don't see your line of reasoning in that Pentax is inadequate in their lens selection.
But tell me this, does Canon have a high quality 16-45mm F/4 zoom that costs $350? Does Canon have a high quality 14mm F/2.8 prime that costs $600?
Canon has their pro base covered with full frame 17-40mm F/4 L, and a full frame 14mm F/2.8 lens. But what about their semi-pro range for those who don't want to splurge a car worth for a camera? They'd have to pay double for full frame equivalents. How is that a good buy?
That's where Pentax excels in. It may not be the best choice for professionals that depend on their camera system costing five figures that puts food on the table. But for your average consumers, it'll easily give canon/nikon a run for its money.
All in all, each brand has their own strengths and weaknesses. To claim a brand is the end all-be all is just ludicrous. It's up to the consumer to decide what they find is important and to find the brand that best suits their needs.
Justin Case - Monday, January 1, 2007 - link
> However, as of March 2007, they will come out> with their own line of DA* lenses, that will
> directly compete with Canon/Nikon's professional like.
Yes, I'm sure that in March 2007 they'll magically be able to match the line-up that Canon and Nikon (and Sigma, etc.) have put together over the last decades... sigh...
Are you seriously saying that people should pick an SLR system based on some vague marketing promises for the future...?!?
And, as I've written above, what matters isn't the lenses that Canon (or Nikon) makes, it's the lenses and accessories that can be used with their cameras. And virtually every good lens out there comes in Canon and Nikon mounts, if only for economic reasons.
Calling the DA 16-45 a "good quality lens" is stretching it a bit. If that's your idea of good quality, I guess we're playing on different leagues. I've seen Mini DV cameras with less chromatic aberration and better corner sharpenss.
http://www.pbase.com/tcom/image/26868740">http://www.pbase.com/tcom/image/26868740
http://www.pbase.com/tcom/image/26883592">http://www.pbase.com/tcom/image/26883592
http://www.pbase.com/tcom/image/26883311">http://www.pbase.com/tcom/image/26883311
http://dc.watch.impress.co.jp/cda/parts/image_for_...">http://dc.watch.impress.co.jp/cda/parts/image_for_...
http://dc.watch.impress.co.jp/cda/parts/image_for_...">http://dc.watch.impress.co.jp/cda/parts/image_for_...
etc.
The only "good" (meaning sharp, balanced, CA-free) images I've seen from a DA 16-45 were scaled down to 640x480 and so post-processed that I felt sorry for the original photons.
It's not exactly up to the level of a Canon 17-55 2.8 or even a 10-22 (which isn't even considered very sharp). Yes, I know those are more expensive, but there are also cheaper alternatives for Canon / Nikon cameras (from the original manufacturers as well as from Tokina, Tamron, Sigma, etc.). Canon's 18-55 kit lens costs $100 and if it's not sharper than the DA 16-45, then at least it's very, very close (for 1/3rd of the cost!). Pentax makes a few great lenses, but that ain't one of 'em. In fact, can't say I remember any Pentax zoom that I'd rate as "good" (they do have some good primes).
Anyway, my point is that if you want a good lens, and you have a camera with a Canon / Nikon mount, you can get it. Reading this AT "article", one would get the impression that K-mount cameras not only have the best of the best lenses, but also the widest lens selection, which is simply not true.
If you read my posts above, I've written that every camera body in this test is a good one, and they can all be "the right choice" in some circumstances. My issue is with the way the article is written, and how it distorts or selectively omits facts to support its conclusions (ex., the comparison of lens lineup or the comparison of IS/VR with sensor stabilization).
Either the author did that deliberately, or he's written an "SLR buyer's guide" without understanding the point of SLRs (as compared to lighter, cheaper, smaller, and easier to use compact cameras). Either way, it's not a very good service to readers (as isn't the complete absence of comparative sample photos, but I see that more as a symptom than the cause).
gibhunter - Monday, January 1, 2007 - link
You're right about lens selection. Canon and Nikon win hands down. Though once Pentax comes out with those three DA* gems they will match the former at those focal lengths.Having said that, Canon and Nikon will still have the fast ultra zooms (600mm) and they will still have much faster AF speeds in low light. Lets face it, all dslrs have good speed with adequate light but as light levels fall, Canon, Nikon (from D80 and up) and Sony have fast AF speed. Pentax? They refuse to even acknowledge that they have a problem!
Sony's low light images are too noisy though and Canon XTI has less detail in their ISO 1600 images than the XT had which tells me that they are applying too much noise reduction.
No camera system is perfect. Pentax is good in just about everything but lens selection in pro-level glass and AF speed. Sony has noise issues in high ISO. Canon and Nikon do not have built in SR like Pentax or Sony. Pick what deficiency you can live with and base your decision on that.
For me I get irritated with AF speed on my K100D, but the more indoor shots I take, the more I realize that I could not get by without SR and clean high-ISO images I get, so for me the Sony, Canon and Nikon are out.
Yes, I could get IS or VR in Canon or Nikon lenses, but I would have to pay through the nose for it. 18-50 f/2.8 IS or VR are in the $1500 range, 3 times the cost of my camera and nearly four times the cost of Sigma's brand new 18-50 f/2.8 Macro which will be stabilized on my K100D.
So yeah, go ahead, buy Canon or Nikon, but be prepared to pay extra for it.
Justin Case - Monday, January 1, 2007 - link
I wouldn't describe lenses I've never seen as "gems", especially considering the quality of Pentax zooms I've used (ie, not very good).Sony actually has pretty good noise reduction in their compact cameras, borrowed from their camcorders. I haven't used the Alpha, but the sensor is supposed to be the same as in the D200, and the D200 is pretty good. Still not as good as Canon's, noise-wise, but close enough to be competitive (which, for a long time, Nikon really wasn't). So if the Alpha is noisy my guess is the D200 does good post-processing. It preserves detail very nicely.
The XTi has a higher pixel count than the XT with the same physical sensor size. Less light per photosite means more noise. Overall, you probably have the same detail for the whole image, but less detail "per pixel". I think the XTi also comes with different image processing defaults (i.e. "0" sharpness on the XTi is actually the equivalent to "2" on the XT). But I think you can turn NR off, anyway. My real problem with the XT and XTi is the ergonomics. The menus and buttons are ok, but the viewfinder and the grip are just terrible. Don't know what they were thinking. The sensor is still the best out there, unless you go for (physically) bigger ones (1D, 5D, 1Ds).
Unless you have Parkinson's, image stabilization at 18mm is pretty much useless (even "proper" optical stabilization, which is better than sensor stabilization, and fine-tuned for each lens). Using a faster lens (ex., f/2.8 instead of f/4) will give you much more noticeable improvements than stabilization. Stabilization is only really useful above 50mm or so. Below that, in 99% of cases, blur is caused by subject motion, not camera shake, and a stabilizer won't do anything about that; what you need is a faster lens, good low-light AF and low noise.
People can put the Sigma 18-50 on their Canon or Nikon cameras, and it costs exactly the same as the Pentax mount version, so no, you don't have to be "prepared to pay extra" (for the same). The difference is that if you're willing (and able) to pay extra, you can get something better.
The Sigma 18-50 is pretty good at f/5.6 and above, but if I'm going to pay for an f/2.8 lens, I want it to be good at f/2.8, and at that aperture the Sigma doesn't really come close to Canon's 17-55, for example.
Yes, that extra quality has a price (+200%, in this case). But if you're not going to buy good lenses for your SLR, then chances are you're better off with a compact P&S (some have image stabilization, too, and pretty decent lenses).
A "budget SLR" seems like the worst of both worlds. I don't mean the camera itself; newer, better and cheaper cameras are released every 6 months (and you can pick up last year's model for peanuts, in 2nd hand). I mean the lenses. A top-quality lens doesn't devalue, and will give you better results with future cameras. A so-so lens will only look worse as sensor quality increases, and effectively limits your image quality, crippling your fancy new camera.
mongrelchild - Saturday, December 30, 2006 - link
Yes, you did in an above post, completely without explaining your reasoning and labeling the author as clueless for prefering one.
As for primes, one of the best ever pentax lenses is the 28 f/3.5 and is regarded as being massively better than even the 50mm
Here is what you are: A nikon fan who thinks there are no other viable options and who disseminates misinformation, a la ken rockwell to convince newbies to think like you.
Maybe for you there aren't any other viable options. But I could never choose the oversharened messes Canon outputs to the film-like output of a Pentax. I just don't like the way the Canon pictures look. Having never used Nikon (except for a few minutes), Olympus or Minolta , I can't judge their products.
But to imply that anyone who chooses pentax is a clueless fool is ludicrous. Ask ANY current pentax owner is they're satisfied, they'll say yes. Pentax has up until recently been THE standard SLR, whether you like it or not.
Their lenses are exceptional for ludicrously low prices, and their DSLRs are very capable products.
I didn't like the article even though I mostly agreed with it. But it's important to remember it's not a review. Just the author's opinion and weighting of different specifications.
I maintain that if you are not Ken Rockwell, then you are his child molesting twin brother.
Justin Case - Saturday, December 30, 2006 - link
I see you have me all figured out... except... I don't own a single piece of Nikon equipment, I had no idea who Ken Rockwell was until I searched for it, and no, I never said that "Pentax sucks". So either you got me mixed up with someone else, or you live inside a reality distortion field, or you're the article's author posting under a different name... either way, not really worth the time to read, let alone reply.Wesley Fink - Thursday, December 28, 2006 - link
Thanks for taking the time to post detailed comments.1 - I certainly agree SLRs are about lenses and I talked about this in depth in my earlier article "Digital Photography from 20,000 Feet". I did not feel it needed to be repeated in a Buyers Guide, but your point is well taken.
2 - Sigma makes almost all their lenses in Pentax AF mount. It is true they are not available everywhere for Pentax, but you can find the popular and unusual ones like the 10-20mm on eBay, at Amamzon, and some large etailers. THere are MANY more Pentax KAF mount lenses available from 3rd parties than 4/3 mount lenses for example - if that matters to you. It is true Tamron has fewer Pentax mount lenses available, particularly in their newest designs, where the newest Sigma designs are almost all available in Pentax/Samsung.
3 - Compatability does not mean just older MF lenses. THere are many Pentax AF lenses available that are fully functional on the new K10D, K100D, K110D. There are also many KA lenses that do all metering functions on the new Pentax - everything except AF and there is focus assist built-in for that. Older K-mount lenses from Pentax and many other makers also will meter but they do not provide complete lens info to the body - you need to tell the cmera the focal length for AS with the early K lenses. Any lens you can mount - directly or by adapter can meter manually, focus with viewfinder aids, and utilize AS after providing the camera with focal length. This is certainly more than basic compatibility and is worth praising in my opinion.
4 - I agree metering systems are critically important, and should have been covered in the Guide. The K10D offers accurate 16-segment metering and the ability to select multi-zone, center-weighted, and spot metering. You can also turn on (or off) the linking of the active AF point to metering. I did mention the unique exposure programs like the Sensitivity Value program and Hyperprogram with user adjustable aperture and/or shuter speed.
5 - The Nikon D80 and Pentax K10D both provide the most extensive options in the guide. If you are familiar with Nikon menu logic, as you are, the D80 makes perfect sense. However, many have complained that the D80 has everything buried in mensus and is very complex. I find the K10D very easy to use and particularly like the Fn dial with the most commonly used menu items and the RAW button for when you want to shoot a few RAW shots spontaneously. I find the D80 equally satisfying, with great options.
The rest of your points have been addressed in other comments here. In general we are back to the question of what role AT can play in Digital Camera reviews. While you may not agree with my picks based on your personal situation, I think most people will find my expressing an opinion and rational for that opinion more useful than 4 reviews that all end with the same buying rating.
Computer parts are becoming cookie-cutter similar in some categories, while Digital SLRs still have unique personalities and unique lens capabilities in each lineup of new lenses and in the very active used market for lenses. We hope we can provide information so our readers can better navigate that landscape.
haplo602 - Friday, December 29, 2006 - link
after 3 tries with always an error when posting the reply:I agree for most part. Of course my comment was biased with my own experiences :-)
Anyway since my previous reply to you was lost (probably login timeout), I'll keep this short.
Looking from a lens point of view, Canon and Nikon are the clear winners.
Looking from a body features point of view, the Pentax followed by Sony.
Looking on the price, Sony wins (IIRC).
There are many points to argue in between (like weight and bulk of the Pentax body vs the weather sealing). And many people will come down to price (Sony) and accessory options (Nikon and Canon win here).
If you want a faster P&S and you'll never use any other than the kit lens, you missed 80% of what the SLR can do for you. Image stabilisation is available in fixed lense cameras, you don't have to worry about dust on sensor, they offer larger zoom range than any kit lens (up to 12x). Sure they are slower, there's always a negative point somewhere.
As AT is not a photo site, I'd expect a buyers guide to reflect the PC guides. In those you start with a budget and draw out a picture of the capabilities you expect from the PC in the respective price ranges. Than you start to assemble them to meet the stated minimum functionality. I'd expect something like that also from this SLR BG.
Anyway the article is not that bad, has some nice information.