SportsShooter.com: Equipment Profiles
Many of the "top" sports photographers, as in Sports Illustrated, USA Today, and so on, prefer a full-frame camera. Canon's Chuck Westfall, the Canon USA ombudsman admitted some months ago that Canon is reconsidering the 1.3x crop of the 1D Mark-series bodies,and said that when that was originally produced, it was due to cost alone, and that there is little benefit in remaining with the 1.3x FOV crop body now, in this current state of d-slr evolution. Many of the 'top" sports shooters like Robert Beck and Robert Hanashiro have swirtched to Nikon's D3 series for the high-ISO capabilities and the full-frame angle of view.
Bird photographers absolutely love the crop-sensor bodies in the 1.5x and 1.6x ranges because they are "reach-limited". Credential-carrying sports shooters, those actually working events from the press pits and sidelines and baselines in many sports, find that the issue is not being reach-limited, but rather being what is called focal-length constrained. When they are stuck at the end-line of a USA football stadium and a touchdown occurs under 30 yards distant, a full-frame camera shot with one's bread-and-butter telephoto of 70-200,200,300,or 400mm prime lens becomes VERY "tight", and so they have to drop their monopod camera to the crook of their elbow, and grab their 24-70 just to get a shot with a little bit of context, or risk getting nothing usable. Since images in S-I and most newspapers are screen printed, there is no need for much resolution, even for a double-truck in S-I.
Anybody who wants to hear what Canon's official USA spokesman said about APS-H can read it here:
Q&A: Canon's camera tech guru Chuck Westfall | Underexposed - CNET News
an excerpt: "With Nikon and now Sony adding weight to the full-frame market, what role is there for the in-between sensor size, APS-H? (It's about halfway between the full-frame sensors used in the high-end SLRs and the APS-C sensors use in the top-selling models such as the Rebel XTi and 40D. The APS-H is used in the 1D Mark III and its predecessors.)
Westfall: When we introduced APS-H in 2001 with the original EOS-1D, the idea was to compete against other professional DSLRs with APS-C. In that respect it has been extremely successful. At that point it was about what the competition had to offer. It's only been in the last six months that there has been an alternative. We've had a good long run with APS-H.
Going forward, it remains to be seen whether it will continue to be a desirable format. We're not ready to say it's over.
Is there a unique advantage APS-H has over full-frame sensors besides price? Nikon's D3 is a full-frame competitor to the 1D Mark III at about the same cost.
Westfall: At this point, no. Price would be the only thing."