Thanks for the tips, I used a tripod as I find hand holding at 300mm near impossible! I saw a tip on using tele macros on you tube, where you set the lens on max zoom and closest focus, and then the move the camera into the subject. This was the method I used but due to shallow DOF found this difficult.
Think I'll set up
and then focus next time. Does using the flash help things?
Thanks all, Mike.