I have a couple of 300Ds for my bird photography hobby and added the 20D for flight shooting.
My impressions after over 3,000 pics in the field:
Pros:
1. The 5 fps, fast and accurate AF (particularly with my 400 5.6L), and AI servo with selectable settings are allowing me to take flight and action shots I had difficulty doing before with my 300Ds.
2. The specs quote a jpeg large fine buffer (with which I shoot) of 23 frames. In real-life burst shooting at flying birds, I never have to use half that limit. This camera has enough buffer (even more than 23 for fast CF cards) to satisfy the most shutter-happy bird shooter.
3. The low noise at high ISO has extended the performance envelop of my slow lenses (Sigma 50-500 and 400 4.6L) and the range of my flash (Sigma EF500 SDG + Better Beamer). This affords me more hand holding capability - essential for bird shots in the undergrowth or under the forest canopy, as well as on tiny skittish birds like flowerpeckers and sunbirds.
4. The extra 2 megapixels allow me more cropping flexibility and that results into better composition.
5. The 1.6x crop factor makes the 20D arguably the best birding DSLR in the market today for me. And I\'ll choose it over the 1D MII because of this, even if they\'re priced the same. The 5 fps is good enough for my flight shots, although 8.5 fps (of the 1DMII) is certainly better. I don\'t shoot in extreme weather and environment, so the 1DMII\'s weather sealing advantage is not important for me.
Cons:
1. My 20D\'s sensor seems to be prone to dust accumulation during long, sustained bursts. It appears that with its fast up and down movement, the mirror is behaving like a fan and scattering internal dust all over the sensor. I guess this is an inherent disadvantage of high fps DSLRs and suspect that the 1DMII would have the same under similar shooting circumstances. Not a deal-breaker, but I have to clean my sensor more often, an acceptable price to pay to get those flight shots.
2. There is a lockup bug and I had it 3 times in over 3T shots. Not a deal-breaker too, as I also experienced this with my two 300Ds. Just popped the battery out, inserted it back and went on shooting. I wish though that Canon will come out with a firmware fix soon.
3. The 20D\'s LCD is less bird shooter - friendly than that of the 300D. When mounted on a tripod, I have to tilt back the whole thing to check or adjust my settings.
4. For RAW shooters, the 6 frame buffer might be a big concern. I\'m color-blind and can\'t maximize the full post-processing potential of RAW. I\'m therefore a happy shooter of sweet jpegs with the 20D.
All in all, save for minor hiccups, I\'m in DSLR heaven as far as bird shooting with the 20D is concerned.
Here\'s a gallery of recent pics with the 20D:
http://www.pbase.com/liquidstone/macabebe3
I\'m a newbie bird shooter (just started less than 6 months ago) so the pics are not representative of what the 20D can do. In the hands of experienced bird shooters (and with topnotch lenses), this baby should consistently turn out wonderful bird pics.
Romy Ocon
Manila, Philippines
www.pbase.com/liquidstone/wild_birds
UPDATE - November 5, 2004
After over 6,000 shots in the field, I\'m continually amazed at the capabilities of the camera:
1. Low noise at high ISOs allows me hand holding opportunities with my 400 5.6L in low light. I\'ve now reduced the frequency of use of my Sigma EF500 SDG flash (with Better Beamer), allowing for more natural-looking bird pics. Below are samples of high ISO photos.
ISO 1600:
http://www.pbase.com/liquidstone/image/35885910
ISO 3200:
http://www.pbase.com/liquidstone/image/35137004
http://www.pbase.com/liquidstone/image/35885961
2. With the installation of firmware V1.05, the lockup glitch seems to have been cured so far.