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10-10-2008, 01:37 PM   #1
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1.7x AFA and min aperture question

I had a question about the Pentax 1.7x AFA and couldn't definitively answer it, so I pose it here.

I know the AFA requireds a maximum aperture of f/4.5 or larger to work. However, I'm pretty sure you can still set your aperture to f/8 or smaller, and the AFA will still work. How does this work? Any comments/explanations?

Thanks,
Russ

10-10-2008, 02:44 PM   #2
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QuoteOriginally posted by rfortson Quote
I had a question about the Pentax 1.7x AFA and couldn't definitively answer it, so I pose it here.

I know the AFA requireds a maximum aperture of f/4.5 or larger to work. However, I'm pretty sure you can still set your aperture to f/8 or smaller, and the AFA will still work. How does this work? Any comments/explanations?

Thanks,
Russ
if there will be enough light... manufacturers typically say that min max resulting aperture for AF system should be 5.6, but look at Bigma - it works if light is good @ 500mm...
10-12-2008, 03:54 AM   #3
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QuoteOriginally posted by rfortson Quote
I had a question about the Pentax 1.7x AFA and couldn't definitively answer it, so I pose it here.

I know the AFA requireds a maximum aperture of f/4.5 or larger to work. However, I'm pretty sure you can still set your aperture to f/8 or smaller, and the AFA will still work. How does this work? Any comments/explanations?

Thanks,
Russ
The only thing that matters is the aperture wide open, because the camera focusses wide open. So it is unimportant which aperture you select.
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