10 Megapixel SLRs Compared
In items as complex as a camera, different buyers find different features important to their needs. For that reason we will attempt to look at areas that are typically important to some buyers and compare the four cameras in that area.
Pentax K10D
VIEWFINDER: The Pentax has the best viewfinder, followed closely by the Nikon D80, then the Sony A100. The Sony viewfinder is remarkable for a penta-mirror setup, but it is no match for the true pentaprisms in the Nikon and Pentax. The Canon is by far the worst of the lot in viewfinders. Best in this case is measured by brightness of the screen image, ease of seeing the entire screen, and "natural perspective". If you want to see a mediocre viewfinder for comparison take a look at the Olympus E500 which makes the user feel like they are looking down a tunnel.
Canon Rebel XTi
VIEWFINDEER FEATURES: All of the 10 megapixel SLRs have adjustable diopters for dialing in a mild correction for shooting without glasses. The Pentax is the only camera in the group to also offer interchangeable focusing screens.
POWER OPTIONS: The Pentax K10D, Nikon D80, and Canon XTi all offer optional battery grips for providing more power and options for vertical shooting. The Sony A100 does not offer this feature. All four models use proprietary Lithium-Ion batteries that can provide 800 exposures or more before recharge, and the battery charger is included in the retail package. Canon reduced the size and capacity of the XTi battery, which may affect the number of shots between charges compared to the 8 megapixel XT model. The Sony A100 uses a new battery type that is not interchangeable with earlier Maxxum digital camera batteries. Oddly enough, the Pentax K10D turns out to use the same NP400 battery that powered the last Minolta Digital SLRs like the Maxxum 5D, so your spare Maxxum batteries will work in the new Pentax K10D. The Nikon D80 remains a proprietary design that refines and extends the capabilities of batteries used in the D70 and D70s.
ANTI-SHAKE: Minolta pioneered anti-shake built into the camera body, which allowed shooting at slower shutter speeds with any lens attached to the camera. Sony refined and improved the feature. Pentax also has added an anti-shake program that is even more sophisticated than the one used by Sony. Both Canon and Nikon have special lenses with anti-shake motors, but they are very expensive, and anti-shake only works with those lenses.
COMPATABILITY: Nikon and Canon are the brands that most often come to mind when you think of professional photography. They both have large lens lines that work on their cameras. The new Sony uses the Minolta Maxxum lens mount and can mount and work with almost any of the 18 million Maxxum mount lenses sold in the last 20+ years. The Pentax K10D has full functionality with any autofocus K-mount lens, and these lenses have been manufactured for many years. In addition Pentax has special focus assist for ANY Pentax K-mount lens ever produced - which now total about 25 million lenses. You can even use older screw-mount Pentax lenses in manual mode with a screw-to-K-mount adapter
Nikon D80
AUTOFOCUS: All cameras were compared using a 50f1.4 lens, since the shallow depth of field evened the focusing playing field for all cameras. All four 10 megapixel cameras were very fast in focusing and locking on the same subjects - much better than older models like the Pentax *ist D or the original 6 megapixel Canon Digital Rebel. Focusing noise was lowest for the Canon, but it was only very slightly quieter than the Nikon D80 (with a 50f1.4D) and Pentax K10D (50f1.4 FA) which were virtually tied. The Sony was just as fast in focusing, but noisier than the other cameras with a Minolta 50f1.4 lens. Perhaps the Sony would be quieter with the reworked Sony 50f1.4 if anyone could find it and they are willing to pay the new $350 cost Sony is asking. However, this was as fair as we could make it with the 50f1.4 lenses we had available.
Sony A100
FOCUS MODULE: All four 10 megapixel SLRs use some of the most capable focusing modules available from each manufacturer. There are, however, some differences in technical specifications and functionality. The Pentax K10D uses an 11-point focusing system, Nikon also uses an 11 point focusing array with a layout similar to the Pentax K10D, Sony uses an 8-point array, and Canon uses their 9 point focus array that is apparently borrowed from the 30D. The number of points is only part of the story, however, since most manufacturers use the more sensitive cross array for the center point only. The Cross point is sensitive to both vertical and horizontal detail where the single point is sensitive to just one direction. Pentax says they use 9 cross points in their focusing module.
In items as complex as a camera, different buyers find different features important to their needs. For that reason we will attempt to look at areas that are typically important to some buyers and compare the four cameras in that area.
Pentax K10D
VIEWFINDER: The Pentax has the best viewfinder, followed closely by the Nikon D80, then the Sony A100. The Sony viewfinder is remarkable for a penta-mirror setup, but it is no match for the true pentaprisms in the Nikon and Pentax. The Canon is by far the worst of the lot in viewfinders. Best in this case is measured by brightness of the screen image, ease of seeing the entire screen, and "natural perspective". If you want to see a mediocre viewfinder for comparison take a look at the Olympus E500 which makes the user feel like they are looking down a tunnel.
Canon Rebel XTi
VIEWFINDEER FEATURES: All of the 10 megapixel SLRs have adjustable diopters for dialing in a mild correction for shooting without glasses. The Pentax is the only camera in the group to also offer interchangeable focusing screens.
POWER OPTIONS: The Pentax K10D, Nikon D80, and Canon XTi all offer optional battery grips for providing more power and options for vertical shooting. The Sony A100 does not offer this feature. All four models use proprietary Lithium-Ion batteries that can provide 800 exposures or more before recharge, and the battery charger is included in the retail package. Canon reduced the size and capacity of the XTi battery, which may affect the number of shots between charges compared to the 8 megapixel XT model. The Sony A100 uses a new battery type that is not interchangeable with earlier Maxxum digital camera batteries. Oddly enough, the Pentax K10D turns out to use the same NP400 battery that powered the last Minolta Digital SLRs like the Maxxum 5D, so your spare Maxxum batteries will work in the new Pentax K10D. The Nikon D80 remains a proprietary design that refines and extends the capabilities of batteries used in the D70 and D70s.
ANTI-SHAKE: Minolta pioneered anti-shake built into the camera body, which allowed shooting at slower shutter speeds with any lens attached to the camera. Sony refined and improved the feature. Pentax also has added an anti-shake program that is even more sophisticated than the one used by Sony. Both Canon and Nikon have special lenses with anti-shake motors, but they are very expensive, and anti-shake only works with those lenses.
COMPATABILITY: Nikon and Canon are the brands that most often come to mind when you think of professional photography. They both have large lens lines that work on their cameras. The new Sony uses the Minolta Maxxum lens mount and can mount and work with almost any of the 18 million Maxxum mount lenses sold in the last 20+ years. The Pentax K10D has full functionality with any autofocus K-mount lens, and these lenses have been manufactured for many years. In addition Pentax has special focus assist for ANY Pentax K-mount lens ever produced - which now total about 25 million lenses. You can even use older screw-mount Pentax lenses in manual mode with a screw-to-K-mount adapter
Nikon D80
AUTOFOCUS: All cameras were compared using a 50f1.4 lens, since the shallow depth of field evened the focusing playing field for all cameras. All four 10 megapixel cameras were very fast in focusing and locking on the same subjects - much better than older models like the Pentax *ist D or the original 6 megapixel Canon Digital Rebel. Focusing noise was lowest for the Canon, but it was only very slightly quieter than the Nikon D80 (with a 50f1.4D) and Pentax K10D (50f1.4 FA) which were virtually tied. The Sony was just as fast in focusing, but noisier than the other cameras with a Minolta 50f1.4 lens. Perhaps the Sony would be quieter with the reworked Sony 50f1.4 if anyone could find it and they are willing to pay the new $350 cost Sony is asking. However, this was as fair as we could make it with the 50f1.4 lenses we had available.
Sony A100
FOCUS MODULE: All four 10 megapixel SLRs use some of the most capable focusing modules available from each manufacturer. There are, however, some differences in technical specifications and functionality. The Pentax K10D uses an 11-point focusing system, Nikon also uses an 11 point focusing array with a layout similar to the Pentax K10D, Sony uses an 8-point array, and Canon uses their 9 point focus array that is apparently borrowed from the 30D. The number of points is only part of the story, however, since most manufacturers use the more sensitive cross array for the center point only. The Cross point is sensitive to both vertical and horizontal detail where the single point is sensitive to just one direction. Pentax says they use 9 cross points in their focusing module.
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Wesley Fink - Wednesday, December 27, 2006 - link
To be clear the Sony A100 was the Best Buy or the best price among the 10 megapixel models. The Pentax K10D was named Best Value, as the most 10 mepapixel camera for the money. We stand by both those recommendations.spazmedia - Thursday, December 28, 2006 - link
Didn't Minolta get sued for steeling the auto focus idea from Honeywell? ;-)And do all Minolta lenses have focusing motors in the lens? Are they silent when focusing? There are lots of lenses available for Nikon and/or Canon that are not available elsewhere. To each his own.
gibhunter - Wednesday, December 27, 2006 - link
That's just one of the FUD Canon's owners are spreading. Canon is definitely faster, but only accuracy helps you get sharper pictures. It is pretty well known that Canon sacrifices a bit of accuracy for outright speed. Canon is the fastest focusing body and it can mean the difference between taking a shot of a great moment or have it pass you by while you're waiting for the camera to focus, but that's all it is. That's why Canon is so popular with pros shooting sports. I'd venture to say that as long as we're talking about accuracy no system is quantitatively better than another.
Now on topic of optical vs. body based stabilization. It has not been proven either way that one system is better than another. It's been proven that body based system is kind of limited at 1.2 meters (the length tested at dpreview). I have not seen any tests where one system was compared against another, but I have seen examples of 300mm at 1/30th tack sharp on Pentax forums and have taken sharp images hand-held at 1/10th and consistently sharp at 1/20th with my K100D. Optical stabilization is not available on any Canon or Nikon primes. It's not really needed until you get into low light photography where even the fastest primes need to go down to 1/20th or 1/30th of a second. Then you will appreciate having it.
Optical is better at one thing though, it allows for vertical stabilization while you're paning (following a moving object so it's sharp while the background is blurry). Pentax stabilization system can't do it. What it can though is give you stabilization on all your lenses, even 30 year old 50mm primes. I know it can because I've tested it myself using two different manual primes.
What can't be disputed is Canon's lens availability. You can find more lenses at lower prices and you can find great, expensive pro-level quality lenses on the Canon. You can also get USM primes (something not yet available for Nikon unless you consider Sigma.) Canon's bodies leave a lot to be desired as far as control and innovation go, unless you get into $3000+ territory of 5D. 30D pales in features compared to Nikon D200 or Pentax K10D. Then again those features are just a matter of convenience as you can take equally beautiful images with all these cams.
spazmedia - Wednesday, December 27, 2006 - link
I find it strange that you do not see any pics produced by each camera. Essentially all that the author is doing is comparing specs of camera, which to add insult to injury this is done erroneously. On page 2 the Canon XTI was one GREAT advantage not mentioned is the improved autofocus engine, borrowed from the 30D, which according to many reviewers is better than any camera mentioned in this review, and definitely better than the K10D. It helps to get sharp pictures!In any case I advise anyone visiting this site to go to some more thorough review sites on photography to SEE what kind of pictures each camera takes and also try in store each one of them. You can’t go wrong with any of them, except that Canon arguably has the best lens lineup for the price and low noise, Nikon have to arguably the most useable cameras, Pentax and Sony have the best bang for the buck, body wise (but not when it comes to lenses, which are more expensive and low availability) Anandtech is good for computer hardware reviews, but for photography, they still have some work to do!
Wesley Fink - Wednesday, December 27, 2006 - link
This is a Buying Guide and not a full-blown review. The viewfinder images were mostly shot with the camera they are identified with.We welcome criticism at AT, unlike some other sites. However, it is frustrating to be criticized for inaccuracy in leaving out info when that info is in the review. On p.1 "All of the 10 megapixel SLRs are faster than their predecessors - borrowing processing engines from higher priced models (Nikon and Canon) or pioneering new high-speed processing circuits (Pentax and Sony)." Then in the Canon XTi section on p.2 "Canon basically increased the resolution of their CMOS sensor used in the 8 megapixel Rebel XT to 10 megapixels, and dubbed the revised camera the Canon Rebel XTi. They did incorporate the improved image processing guts of their semi-PRO 30D and finally added their own dust removal system . . ." Perhaps you should read more closely.
spazmedia - Thursday, December 28, 2006 - link
Thanks for the reply. I did read through "fairly" closely and I still don't understand how you can associate "image processing" with auto-focus, to me these are two different things. I think it would be worth mentioning clearly that the Rebel XTI focuses faster and more accurately than its predecessor, seeing it is top of its class in this respect. This is probably the single biggest reason for upgrading from the previous Rebels and I way I hate Canon for dolling out features.And I still think a few images from each camera would have been nice.
AT is usually very thorough and I would have expected this in their camera reviews/buyers guide as well. Maybe some sort of table comparing features would have been useful.
finbarqs - Wednesday, December 27, 2006 - link
i've taken one photography class in black and white, and that opened up a whole world of photography for me and the wonders of the camera. I mean both Pentax and Canon and Nikon all pioneered something in their field, and i'm sure they have their strong points and their weaknesses. The truth is, the weakness being digital, and having the dynamic range of film is quite difficult to obtain. Sure we can use Neutral Grey Density filters, but still not quite the right thing. Then we can setup a tripod and do the "Dynamic Range" in photoshop but that's just up to the person.Personally, I wish i had enough to purchase the Canon 5D just so i can have their full frame image sensor. I hear it's the closest you can get to the reaction of lighton the film emulsion surface vs. film on the sensor surface. I may be wrong again since this is my first class, but then again, i've learned a lot from this class. Besides, I've taken awesome shots with the XTi, and i know for a fact that changing different cameras will only improve it by a little bit.
*sigh* might as well go back to film :D
Justin Case - Wednesday, December 27, 2006 - link
The bigger sensor on the 5D (and 1Ds) gives you shallower depth of field, which increases your "artistic" control over the image. Also, the fact that the sensor is physically bigger means it can receive more light, and therefore produce an image with less noise. But the size won't really influence the dynamic range of the sensor.With film, you can sometimes get some detail in an area that was overexposed by 3 or 4 f-stops. With digital, that range is about 2 stops, if you're lucky (and shoot in raw mode, of course).
So yes, in that sense, digital still can't quite match film, but it already has less noise and more detail, so, for correctly exposed images, it already beats (35mm) film, even with smaller sensors. If you need a higher range, then you can use exposure bracketing but, of course, that isn't always possible, so film still has its place.
finbarqs - Thursday, December 28, 2006 - link
umm... from what i've learned, Depth of Field is determined by the setting of the apeture (F-stop) the lower the F-Stop (bigger apeture) the less DOF you have. Of course, again the benefit of the 5D and the 1D is not the Depth of Field, but having all lenses "normal". Meaning, a normal lens would be 42-55mm again, standard wide angle is 28mm, and standard telephoto portrait would be 135mm (of course anything above normal would be tele, anything below normal would be wide). And to get more detail, usually we just stop down as much as we can (since 35mm is usually limited to f/22 or f/32 -- most i've seen unless shooting with medium format or greater). Oh well... Detail lies within the size of the film as i have learned, and as far as digital goes, both size and quality of the sensor. The CMOS chip, is quite impressive.Justin Case - Friday, December 29, 2006 - link
> from what i've learned, Depth of Field is> determined by the setting of the apeture (F-stop)
For the same sensor / film size, yes. But if the sensor size is different, that will also affect the DOF. A smaller sensor will give you a narrower FOV and a bigger DOF, using the same lens and same aperture. That is why it's virtually impossible to get nice out-of-focus backgrounds with small digicams - the sensor is too small.
For example, if you put a "100mm" lens on a 1.5x crop factor camera (like a Nikon D200), where the sensor isn't the same size as a 35mm frame, you'll actually get an image equivalent to a 150mm lens (on a real 35 mm camera), and also bigger DOF. Which is good for holiday snaps, not so good for "artistic" photography.
Also, most lenses are optimized for f/stops between f/4 and f/16 (f/8 and f/16 for cheap ones). If you close down more than that, quality actually starts to get a little worse at the focus point (you will increase the DOF, so you have more things in focus, but focus is never quite as sharp - it's a tradeoff).
"Detail" is a broad concept. More pixels doesn't necessarily mean more detail, because as you cram more pixels into the same sensor area, each one gets less light, and is therefore less accurate (i.e., you get more noise, and that can actually make a sensor with more pixels produce _less_ detail). A similar thing happens with film: more sensitive film will give you less detail, because it has more grain.