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Old 12th December 2016
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steverh steverh is offline
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Re: Teleconverts again

Originally Posted by Mark_R2 View Post
Some observations:
I have the Sigma 50-500mm and use it with my EM-1. It is quite decently sharp up to 400mm. AF is a bit twitchy even with the EM-1 (even with its phase contrast AF support). I can C-AF racing cars with it but not especially reliably. The lens is huge and heavy. I made an extra long hood for it and that improves contrast a lot. Even so, it is best to keep the sun behind you.
A friend uses this lens on his Pentax - as Mark says it is HUGE and weighs half a ton. He does get good results with it.
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