Sigma 300mm f4

Started Feb 5, 2013 | Discussions thread
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MikeM42
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Sigma 300mm f4
Feb 5, 2013

I have an old (bought used from B&H at least 12 years ago) 300mm Sigma f4 AF lens that is incredibly slow to focus on my Alpha 99 and before that an Alpha 900.  I don't recall how it was with an Alpha 700 but am relatively certain it focused fine with a Minolta 7 film camera.  Does anyone else use this lens with a Sony Alpha?  Is it possible that a firmware upgrade from Sigma would improve AF performance? I remember having it upgraded years ago for my film camera.

thanks!

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