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I'm looking for a 2x or similar teleconverter for my Tamron 70-200. I don't believe there's any that would allow me to keep af correct?
Out of the manual ones, which are better in terms of sharpness? I found a Sigma APO 2x converter on ebay, I guess it will allow me to af older Sigma glass (if I had any) but my Tamron would be manual? Does it reduce sharpness a lot?
There's a few vivitar series 1 2x converters, reviews on Amazon are rather mixed.
Basically need advice on a model) the Pentax HD one is out of my budget for now, so something around 50-150$ would work for me.
Thanks in advance)