In one of the magazines out at the moment there are review of lens between 55-200.
I am considering Tamron and Sigma as cheaper alternatives to the Nikon lens. They all seem to function the same but has anyone had any experiences. I have seen a Sigma lens for £80, and the Tamron is around £100 on the High Street. If the Tamron is more expensive, is it made better? Many thanks for your help.