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04-10-2012, 10:40 PM   #1
Steve hobbs

Vivitar 1.4x teleconverter

Will the Vivitar 1.4x teleconverter from B&H autofocus when attached to my Sigma APO 70-300 f4.5-5.6 and/or my Sigma 70-200 1:2.8 II HSM and K5 body.

04-10-2012, 10:54 PM   #2
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it should AF with your screwdrive lens, but not with the HSM one.

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