Thanks for the feedback, I am doing a shoot tomorrow so I will give it a good try then
Biggest problem so far (if you can call it a problem) is I cannot fit my camera in my bag with this lens on. It has a nice big leather case for the lens but I dont want to really carry that around. I have also had to order a different lens cap as I cannot get the lens cap on or off when the lens hood is on. I have ordered a center pinch type to make it easier
There is no switch on this one just a ring at the end, £350

Crikey I did get a bargain then