| Re: Sigma 150-500mm OS HSM or Nikon 80-400vr
I use a Sigma 150-500 and it is a good lens but I have noticed that long distance images at 500mm are a wee bit blurry. This could be a problem more associated with me rather than the lens of course. Overall build quality is good, it has a handy bracket for mounting to a tripod which helps balance and allows you to turn the camera from landscape to portrait very easily.
You lose AF when using a x2 convertor and have to rely on your eye to focus.
I do believe that AF is retained if you use the Nikon x2 convertor on a Nikon lens.
Personally, if I had the choice now, I would go for the Nikon over the Sigma.
Hope this helps.
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