September last year I had all my gear stolen (D300 and 10-20, 24-70, 70-200 Sigma's), it was all replaced on insurance no problems. I added some of my own money and moved to a D700, Nikkor 16-35VR, Nikkor 24-70 and Sigma 70-200. I chose the Sigma again because my stolen one was exceptional and I couldn't stretch the budget to a Nikkor version.
Since getting all the gear I have changed what I shoot quite a lot. I used to do a lot of motorsport, but now I do more portraiture and landscape work. As such I haven't really used the 70-200.
The times I have used it I have noticed it isn't as sharp as my old copy, the zoom ring is stiff and it suffers more CA's than the one it replaces.
Does anyone know what my options are here? It was bought from a local store (not a grey import) last October, so is under 12 months old. It isn't convenient for me to get into the store I bought it from for about the next month, so I thought I would ask here.
I get along with my local store really well, but do you think CR Kennedy will want proof of my claims if it is sent back?
Something I'm not really sure of, would the move to FF accentuate CA's? Or is that something fundamental in the lens?