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Message: <blockquote data-quote="evan447" data-source="post: 166365" data-attributes="member: 13572">the sigma 50-500 and 150-500 are f6.3 at anything over 200mm making them rather light hungry, the af on your d3200 may become a little sketchy due to this. forget the teleconverter! also the effective focal length of both lenses reduces rapidly as you move closer to your subject, at 500mm both are on the soft side with questionable af performance.the best option for dx would be a used 300 f4. use it on its own for a while to learn some long lens technique and then add the nikon tc 14ii........fixed focal length but far better all round. i was in the same situation looking at the sigmas but too many bad reviews particularly the 150-500.</blockquote>