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04-05-2014, 11:01 AM   #1
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new pentax teleconverter

will it work on sigma lens. I have a sigma 70-200 2.8 and sigma 50-500(non os) and 24-60(2.8)

04-05-2014, 11:17 AM   #2
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Word on the internet is (and I was confirmed by Ricoh representatives) that autofocus would *not* work with any HSM enabled sigma lenses, which means if your 70-200 is any of the HSM variants, your autofocus won't work. Can't say for the 50-500 and 24-70, but chances are good they'll work (albeit the exif data won't be "corrected").

Last edited by Mazhe; 04-05-2014 at 01:41 PM.
04-05-2014, 12:44 PM   #3
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The Sigma 150-500 focuses but the focal length and fstops are not adjusted.
04-05-2014, 01:21 PM   #4
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QuoteOriginally posted by rick pafford Quote
will it work on sigma lens. I have a sigma 70-200 2.8 and sigma 50-500(non os) and 24-60(2.8)
I think the only way to find out is to try it, as it depends on the lens. I think it all boils down to the firmware inside each sigma lens.

For example, with the 30mm "Art" the HSM motor would operate, but the camera never confirms focus.

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