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Focus
OK
Reliably raise the probability of focusing the first image by
tracking the subject for 0.5 sec. before the shutter is released
Track the subject with predictive computation for 0.5 sec. (*)
prior to shooting, then shoot continuously
Press the shutter button fully
after the AF has operated
for about 0.5 sec.
Steady focus from the first image
First image countermeasures
Pressing the shutter button halfway, or
the AF ON button so the AI Servo AF
operates, then pressing the shutter
button fully to start shooting means
there is a higher probability of obtaining
photos that are in focus from the first
image.
AI Servo AF is a function that determines anticipated subject movement, then
carries out focusing based on a prediction of the subject’s location at the
instant the shutter is released. Prediction is an important point when using
this function effectively. For example, comparing a photo of a moving subject
taken by suddenly pressing the shutter button fully when AF is not in
operation, and a photo taken after pressing the shutter button halfway and
continuing to operate AF by keeping the button pressed, the focus probability
of the latter will be higher. With AI Servo AF, ensuring a certain amount of
time for the predictive computation to be carried out for moving subjects is a
technique for achieving well focused results.
EF300mm f/2.8L IS USM 1/2500 sec. f/4 ISO100
