A99 Autofocus issue

Started Jun 4, 2014 | Discussions thread
eddiewood Contributing Member • Posts: 626
Re: A99 Autofocus issue

havoc315 wrote:

The teleconverter makes the aperture f8 at the telephoto end.
The a99 AF system is not designed to work at f8. In fact, most dslrs cannot AF at f8. I believe 6.3 is the maximum aperture you can AF with.

Remember, the SLT mirror only reflects a portion of the light to be used for AF. The AF system on the Nex 7 may simply be better at autofocus with a smaller aperture.

Not quite.  The centre point works at f8 when using the AF 500mm Reflex.  It's something that is commonly overlooked.

The AF on the NEX-7 is disabled when the adapter is used, the adapter has its own SLT and PDAF module so should, in theory, perform the same as a PDAF module in the A99 (or at least the A65).


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