Lens' maximum aperture & AF sensitivity
- Thread starter TBing
- Start date
when the lens is mounted on the camera, it will be switched to maximum aperture to maintain a viewfinder as bright as possible. this also helps the AF points to detect contrast n focus more accurately. so from this theory alone, bigger aperture = more light enters thru the lens, n u will get a brighter viewfinder + the AF points receive more light for focusing. since there's more light available, it will be easier for the AF points to detect the contrast n focus accurately. this is particularly useful when tryin to focus in low light situations.
otherwise, smaller max aperture = less light enters the lens = dimmer viewfinder and the AF system will hunt more than usual in dark situations.
hope this helps
I read from manual saying that "max aperture up to 5.6 the cross-type AF sensitive to both vertical & horizontal lines are possible". What does this mean???
"With 2.8f, the center AF point's sensitivity to vertical & horizontal lines is about twice as sensitive as the other AF points". What does this mean as well?
"With 2.8f, the center AF point's sensitivity to vertical & horizontal lines is about twice as sensitive as the other AF points". What does this mean as well?
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