Adding themselves to the Canon 40D review pile-on, Imaging Resource has posted their review. The main point is that not a whole lot has changed from the earlier D models, but that’s a good thing: if it ain’t broke, don’t fix it, and that line of cameras has always been well-liked and produced excellent images.
From the various improvements that it does have, Imaging Resource likes the sealed body, the faster frame rates for burst shooting, and the larger viewfinder; the reviewer doesn’t really care so much about live view, the larger LCD display, or the increase in resolution.
They did find a few issues with the autofocus system which I haven’t seen mentioned in other reviews. It may not be much, but it may be something worth considering. Autofocus is one of those features that lots of people overlook, but plays a much bigger role in real-life shooting conditions than many people think about. Here’s what the review has to say about the issues they saw:
Canon says that the various improvements make the EOS 40D’s autofocus calculation speed 30 percent faster and more accurate than the EOS 30D, and better in low light. The 20D and 30D have what I consider to be the best low light AF system on the market for the price, focusing on a person lit only by a television screen, and it does seem that the 40D can best them in some situations.
However, there have been quite a few situations where the Canon 40D kept on seeking when the 20D just quickly found and locked focus, specifically when the 40D was in Multi-point AF mode. I’ve found a few situations where the Canon 40D just seeks and seeks, and never stops. Most cameras give up after a few seconds. This is the first autofocus SLR of any make that I’ve seen do this. You can turn Focus Seek off in the Custom Function menu, but that still doesn’t stop the endless seeking. Oddly, this occurs more for me in vertical mode.
In horizontal mode, Dave had a heck of a time getting the Canon 40D’s top center AF point to focus on Marti’s hair during the indoor shots. Hair isn’t the best place to focus, of course, but it works well enough when we do it with other cameras. In Dave’s case, the camera said it was in focus, but it was either front- or back-focusing.
When shooting a soccer match in AI Servo mode recently, the Canon 40D had a hard time finding and keeping focus on my subject. It was usually okay if I could keep the player over the center point, but not always. It still randomly focused many yards behind a player for one frame, then snapped back to proper focus, then back out. Soccer is an extreme example — and I am spoiled by shooting the 1D Mark II N, and even the 1D Mark III — but the 20D does better than the 40D in these situations. I got better results shooting in AI Focus mode, which is probably more appropriate for a more random movement game like soccer.
However, when it’s working well, the AF is very good:
Testing in the lab proved that the EOS 40D does even better than the company claims, focusing accurately at less than -0.5 EV (1/4 foot candle), all the way down to 1/16 foot candle, the lowest light level we test. Of course, that’s with a high-contrast black and white test target, and we have no way of knowing what Canon’s test conditions are.
In summary, I’ve found the Canon 40D’s AF system to be stronger in some ways and weaker in others when compared to the more predictable 20D and 30D AF system. I got more consistent results in single-point AF mode.
Personally, I’m ok with that, since I always shoot with just the center AF point selected, and I know a lot of other photographers do the same thing. Maybe camera makers need to find some extra-special improvements that they can offer for shooters like us — an extra-super-sensitive center AF point? I suppose they already did that by making the center point cross-type before the other points (though on the 40D they’re all cross-type) but maybe there’s something left, like the Olympus E-3′s new double cross AF points? Just a random, uneducated thought.
Other possible significant negatives that the review points out are horizontal banding at 3200 ISO and a shorter battery life, due to the larger LCD screen and the automatic anti-dust shake system.
Be sure to check out the full review for all the details and the sample pictures, as always.