Pros Price/performance - very fast and accurate autofocus - low noise high ISO settings - works very well with EOS 580 EX flash - controls are awosome - very fast photo write speed with Lexar 80X WA cards
Cons The built in flash is good - but I use an external flash for better performance
Summary Photos come out best when taken in Raw mode and then processed as Tiffs on your PC.
Digital Photo Professional software that comes with the camera is a lot better than the older versions in speed, preview capabilities, workflow and user friendliness.
Pros Much better feature set than its older brother, the 10D, for not that much more money.
Cons Lockups! Check the photography forums, many are experiencing lockups with this camera (myself included) and so far, it doesn't look like Canon is addressing this issue. If they can fix this with firmware, they I'll give it a thumbs up! I'm usually not
Pros quick and durable with a large buffer
Cons small sensor 1.6 crop factor
Summary One reviewer called the 20D "the wedding camera" and I would have to agree. Another field where the 20D excels is sports photography. I recently attended an airshow with hundreds of aviation photographers from around the world. The vast majority were shooting with the 20D. You can't get a better camera for the price.
When shooting action outdoors, you need to be able to change settings quickly. The 20D makes this easy. I have also used the camera in my studio where it performs just as well. As many have noted, there is almost no noise at ISO settings up to 800. At 1600, you start to see some artifacts.
I don't change lenses very often, but recently I noticed some dust on the sensor. I was able to blow it off easily and did not need to wipe it or have it professionally cleaned (never touch the sensor!).
If you're just an enthusiast who likes to take photos, the Rebel XT will be good enough for you but if you are a semi-pro who is known for fine photography, then this is the camera for you.
Pros High resolution images. Instant review of photos. Rugged body. Overexposure warning. Histogram possible after every shot and in review mode. Rugged body. Custom functions.
Cons Lack of support for older 3rd party EOS compatible equipment.
Summary I will first address the only CON I have. I had to replace some 3rd party equipment that I had used with a Canon Rebel and Elan. A sigma 75-300 mm lens and a Sunpak 4000 flash had to be replaced. The lens caused the camera to lock up, and the flash just plain wouldn't fire. Canon was of no help since this was 3rd party equipment. I replaced the lens with a used 100-300 mm canon lens, and I bought a new Sigma flash that works with new Canon digital cameras (E-TTL II compatible). Just check some review sites to see if any existing equipment will have problems working with Canon Digital cameras.
The camera itself is just awesome. Just the feel of this camera in my hands, compared to the other consumer-oreiented cameras, was great. The camera felt like it was built to last. Previously I shot film, and I will say the instant feedback of seeing your shot immediately after you shoot is wonderful. You can also set the display up to show a smaller picture, but with a histogram that shows if you have under or over exposed your shot. You have exposure compensation and flash exposure compensation at your fingertips as well.
The ability to switch ISO settings from one shot to the next just can't be beat. The controls were fairly intuitive, but plan on spending some time to get used to the controls.
The camera has mirror lock-up (custom function) and a PC termial. I use the former for landscape work and the latter for studio work.
I also purchased the add-on batter grip that takes two rechargeable batteries or can also use AA batteries in a pinch. The grip also has extra controls that make vertical shots a breeze.
The autofocus is quick. Autofocus assist is available on camera and through an appropriate hotshoe mounted flash. Start up time is super quick. I personally noticed no shutter-release delay. There is a DOF preview button.
I could go on and on, but I will end with the fact that I highly recommend this camera to anyone who hasn't invested too heavily in older 3rd party EOS-compatible equipment.
Pros speed, compatibility with Canon lenses, price, great pictures, 1600 iso
Cons 1.6 lens factor
Summary This camera has put 'fun' back into photography. I love the 'instant' on and more importantly, instant shutter reaction. The point and shoot digitals have their advantages, but the 20D has put excitement back into Photography for me at a reasonable price. I did a wedding for a friend recently with the 20D, and, even though I had quit doing weddings years ago because they were just too much work, with the 20D I became hooked again! It was a blast! I would definitely recommend this camera to those looking to upgrade to a digital SLR.