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When an AI Servo AF photo of a moving subject is viewed on a computer display and the photo seems to be slightly
unsharp, it is incorrect to assume that a focusing issue is always the cause of the problem. Even in photos shot with a fairly
fast shutter speed, the lack of sharpness could be a result of subject movement or camera shake. This is particularly relevant
to the EOS-1D Mark IV because even small levels of motion blur are noticeable at 100% magnification due to the camera’s
16.1 megapixel resolution. First, determine whether the sharpness problem is caused by poor focusing, camera shake or
subject movement. If it is camera shake or subject movement, an effective countermeasure is to use a faster shutter speed.
Up to now, if you thought increasing the shutter speed by one stop was sufficient to eliminate motion blur, try increasing the
shutter speed by two steps and then shoot the photo.
EF200mm f/2L IS USM 1/2000sec. f/2.8 ISO6400
Camera shake thoroughly suppressed
with faster shutter speeds
In order to suppress minute camera shake
that is visible when images are viewed at
100%, daring to use fast shutter speeds
like 1/2000 sec. can be highly effective.
Take advantage of the higher ISO speed
image quality and strength of the EOS-1D
Mark IV, use the fast shutter speeds.
Minor motion blurs can be suppressed with high speed shutter
speeds of 1/1000 and 1/2000 sec.
Countermeasures for minor camera shake visible at 100% display
