Thanks Bob
Sorry for the confusion, I'll try again
Does anyone have any experience of the Canon EF15mm fisheye lens, good or bad? or can anyone suggest alternatives?
I can't use EFS lenses as they protrude into the camera body (I will be placing a filter in the light path within the camera body, EFS lenses would hit the filter)
Are the Sigma lenses (10-22mm, 10mm) compatible with FF cameras like 5D, in other words don't protrude into the camera body as in EF lenses?
Hope this makes a bit more sense
Steve