Canon Data Back FN brand_Visibledust Includes the M extension tube

Includes the M extension tube for 1:1 magnification (the lens by itself provides 1:2 magnification

high quality loupe

It records a 170 degree image from corner to corner with all the circular distortion you'd expect from a fisheye

It's in good working order

lens is clear

Canon Data Back FN brand_Visibledust Includes the M extension tubeThe Canon Data Back FN attaches to a Canon New F 1 camera (not included) and provides basic three field data imprinting capability. The "Year" field includes years from 82 to 92, plus 0 8, a g, and I to IX. "Month" has 12 months, plus A to G, and the "Day" field has 31 numbers. In very good condition, with minor cosmetic wear. Includes box and case.