Canon EOS-1 Settings Manual page 34

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Special Article
Requirements for sharply focused photos
Motion blur can be suppressed by
utilizing faster shutter speeds
EF200mm f/2L IS USM 1/500 sec. f/4 ISO3200
Avoid
Photos that look sharp at a glance, however...
25% 50% 100%
Viewed at 100% on a computer screen you can
see it is slightly blurred
When viewed initially there is very little cause for concern, however, when viewed at 100%, an image
that is slightly blurred could be caused by the use of a shutter speed that is too slow to stop the action.
Often the cause of this is not focus, but rapid subject movement
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