Timeline for Why does the autofocus capability depend on the aperture rather than the amount of light available?
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| Dec 30, 2017 at 23:40 | comment | added | chili555 | Here is a pretty good discussion: community.usa.canon.com/t5/Lenses/… With most extenders, you lose one stop of light and so autofocus is usually disabled at f/5.6 (effectively f/8) because, in most situations, autofocus will not work anyway. I must admit, however, that when I last photographed the sun, I did use an extender! | |
| Dec 30, 2017 at 23:18 | comment | added | JonathanReez | But then why do some cameras disable the autofocus if you attach a f/5.6 lens with an extender? The camera obviously think the autofocus will no longer work, but practically speaking it will as long as there's enough light. To me this makes even less sense than asking users to buy a light meter :) | |
| Dec 30, 2017 at 21:46 | history | answered | chili555 | CC BY-SA 3.0 |