I'm amateur and I want to try something new. I have Nikon D3100 with Nikkor AF-S DX VR 55-200/4,0-5,6 G ED and I'm shooting everything - animals, landscape, people, sport, ... (like real amateur :D ).
I was looking at Sigma APO 135-400mm F4.5-5.6 AF (I found it for good price), but I think it's quite old lens. It interests me because of it's focal length and I'm thinking about buying it instead of current lens.
I want to ask: What would be difference between Sigma and Nikkor lens? Except VR and focal length. Could there be some problem with my D3100? Could it be slower or less acurate (auto-focus)? Could there be some difference in resulting image (colors, sharpness) because of lens age? Can I have any problems shooting from hands without VR?
Do you have somebody experience with that Sigma lens?
Thanks for your reply.