The Canon FD 600 F/4.5 Super Telephoto lens is a proven optical design that now incorporates some additional features that add to its versatility and ease of handling. However it still offers high performance and reliability in a super telephoto lens. This lens incorporates smaller, more convenient controls and such advantages as a friction lock system for the focusing control knobs, F/32 minimum aperture for increased depth-of-field, an oversized aperture control ring with two scales and a "one-touch" release revolving mechanism permits fast changes from horizontal to vertical format photography. This 600mm lens provides an image 12X larger than as seen with a normal, 50mm lens and is designed for mounting on a heavy-duty tripod. SPECIFICATIONS Type: telephoto Construction: 6 elements in 5 groups Angle of view: 4 degrees 10 minutes Minimum Aperture: F/32 Closest Focusing Distance: 27ft Filter size: drop-in type 48mm with holder Lenshood: Built-in; extension hood EH-150 Length: 18 3/16 in Weight: 134oz.