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Old June 14th 18, 09:46 PM posted to rec.photo.digital
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Default The alternative to the ultra-fast long telephoto?

In article , Alfred
Molon wrote:

Specifically, when Autofocus capability is disabled when a certain
f/stop value is exceeded.


Why?


because it no longer works properly, or is too slow to be useful.

If memory serves, the common "upper limit"
value had been f/5.6, with some exceptions at f/8 (such as offered
only on higher end bodies, and/or only at the center focus point).


I have the Olympus 75-300 which is F6.7 at the tele end, but autofocus
works also at the tele end.


not very well, it doesn't.