Sigma 500mm F4.5 EX DG HSM Q&As

Announced Feb 14, 2005 •
Telephoto prime lens | Canon EF, Nikon F (FX), Pentax KAF, Sigma SA Bayonet, Sony/Minolta Alpha | 184
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Got myself recently a used Sigma 500mm F4.5 DG EX HSM to get some more reach, but i have some problems with extenders.  In earlier times it was often reported that this lens should only focus on 1D bodies using converters so i thought it should not have any problems with 5D mk3 that has same level AF system. But still it seems i have some problems locking down on AF spot. So at the moment i have tried with canon II extenders both 1.4X and 2X with and without taping the pins. It seems that the...
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