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04-03-2012, 06:02 AM   #1
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Sigma 1.4x converter vs Sigma APO 1.4x converter

Sigma has a 1.4x converter that is not marked APO. They also have the APO 1.4. Anyone know how they compare?

Thanks

04-03-2012, 07:37 AM   #2
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I don't know the non APO converter, but the APO converter is specifically for use ina very limited number of Sigma (and Pentax FA) long fast tele and tele zoom lenses.

to use the APO converter you need to have the rear of the lens relitively open. By this, I mean that the rear of the lens needs to be at least 35mm inner diameter, and the rear element and all mechanical parts recessed 12mm deep.

This is because the front element of the tele converter actually protrudes into the rear of the lens.
04-03-2012, 07:48 AM   #3
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Wow...didn't know that. APO is a very touchy converter then.
04-03-2012, 07:50 AM   #4
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QuoteOriginally posted by slackercruster Quote
Wow...didn't know that. APO is a very touchy converter then.
somewhere, i posted a listing of all the lenses listed in the printed compatibility guide that came with my 1.4x and 2x TCs. It would be a useful guide

check this thread

it may not be all inclusive but it is what I know

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/40883-sigma-ap...tml#post383100


Last edited by Lowell Goudge; 04-03-2012 at 08:14 AM.
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