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06-13-2011, 09:09 PM   #1
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1.7X AFA + whichever lens

What focal length do you enter when the camera asks? The number for just the lens or the focal length for the lens X the 1.7x adapter?

06-13-2011, 09:38 PM   #2
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I usually use whatever the multiplied length is, or as close as I can get to it.

06-13-2011, 09:41 PM   #3
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Yes, when you add the teleconverter, the lens "becomes" a lens with 1.7x the focal length (with ramifications regarding f-number as well).
06-14-2011, 05:43 AM   #4
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QuoteOriginally posted by m42man Quote
Yes, when you add the teleconverter, the lens "becomes" a lens with 1.7x the focal length (with ramifications regarding f-number as well).
Quite right. The lens+TC combination 'becomes' a different lens. So if you mount a 50/1.4, if becomes an 85/2. Tell the SR'bot that the focal length is 85mm, and realize that f/2 is now the maximum aperture.

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