Action photos are not really the domain of the Canon
5D as it features only a frame rate of 3fps. The D2x can do 5fps at
full resolution and also has a High-Speed Crop mode that allows full
only show some samples with the D2x here.
We would say that bird photography starts at about 300mm FOV (for
larger birds) and then 400-1200mm are often needed with smaller birds.
High-Speed Crop sequence shot at 8fps
Photographing sequences at 8 fps is fun.
- 6.8MP files at not bad at all (remember a bit more than a year
ago the max you got from any DSLR at 8fps was 4MP
- We could do the same or better with our Canon 1D2 Mk. II (8MP)
and the 400mm f/4 DO lens. But this is a heavy and expensive equipment
when these kind of photos is not your main domain
Note on noise
Above sequence was shot at ISO 400 (and about 1/3 f-stop underexposed
to prevent losing the highlights). At these levels the D2x starts showing
quite noticeable noise levels in the shadows (not sure how much better
the 1D Mk. II would have behaved though):
Noise already slightly reduced in RSE
Here is a different photo from a full
resolution sequence with the D2X:
Nikon D2x at 300mm (1/800 sec, f/4, ISO 200), FOV 450mm
The high frame rate of the D2x allows
you to cover quite a range of action photos. With Canon cameras
you need two different cameras to capture high res images (12MP or
more) and 5-8 fps images. The Canon 1Ds Mk. II can do 4fps but the
FF sensor would require heavy and expensive lenses to get into this
range beyond 400mm FOV.