Sigma 135 to 400 APO lens on an old Pentax IST D with no stabilization in the body or lens but a tripod still works fine. This eagle is quite far away and was last week so I am slow posting it. This lens has been discounted by Sigma as it is not their new digital model. This one will also work on a film camera as the len's designed for digital SLR's don't cover the area required to expose a complete 35mm negative.