Quote:
Originally Posted by philc
I have a Sony Alpha 550 DSLR and a Sigma APO DG 70-300mm f4-5.6 lens. I would like to buy a 1.4 X teleconverter to extend this lens. Is there one which will work in Auto modes with this combination? And would it also work with my Sigma APO 170-500mm f5-6.3 lens?
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Sorry, but the Sigma converter won't work with that lens. As a general rule teleconverters will only work with F4 lenses or above. Kenco might work but it will be manual focus only.
