Hi Pauline, your shots arn`t bad at all for 280m on a mk3.....at gigrin I had 700mm with them flying close enough to fill the frame so no cropping on most.
As to a wimberley........
http://www.warehouseexpress.com …/default.aspx?sku=1012216![]()
For long lenses a Gimbal type head is pretty much essential if you`ve got it on a tripod trying to use the lens on a ball head or three way pan and tilt is nigh on impossible.
Thanks Sindri 

