Ran across a mint condition 1st generation New Canon FDn 200/2.8 tele and couldn't pass it up. ( 1st generation has the full size fine tuning Helicoid Focusing mechanism same as the Canon FDn 200/4.0 Macro lens ). While the Helicoid Focusing mechanism requires more turns of the collar to go end-to-end it’ll offer me more capability for fine tuning focus (like the Macro lenses) for the kind of photos I go after...(no fast action / sports type photography). It seems to function perfectly on the NEX-7…took a few quick ‘arrival test shots’, elbows resting on kitchen window sill. The ants on the apple peels (put out for deer) were 25' away...the Cardinal, and the Downy + Red-Bellied Woodpeckers 40' away.