For Canon EOS 35mm autofocus single lens reflex and DSLR cameras only. Not for older breechlock lens mount Canons, such as the AE-1, that have a knurled rotary collar around the base of the lens that has to be tightened to lock the lens in place.
Needed to connect your 35mm Canon EOS SLR or DSLR camera body to a T-adapter or camera adapter for prime focus photography (full disc solar/lunar photography and terrestrial photography); to a tele-extender or camera adapter for eyepiece projection photography (planetary photography and close-up shots of the Moon); and to an off-axis guider for long exposure deep space photography.

Canon Model: EOS 10D • EOS 3000 Kit • EOS 30V Date • EOS 620 • EOS 630 • EOS 7s • EOS Elan 7 • EOS Elan 7e • EOS Elan 7e QD • EOS Elan 7n • EOS Elan 7ne • EOS Elan II • EOS Elan IIE • EOS IX • EOS IX Lite • EOS Rebel 2000 • EOS Rebel 2000 QD • EOS Rebel G • EOS Rebel G-II • EOS Rebel K2 • EOS Rebel K2 Date • EOS Rebel T2 • EOS Rebel T2 QD • EOS Rebel Ti / 300V • EOS Rebel Ti QD • EOS Rebel X • EOS Rebel XS • EOS-1 • EOS-10S • EOS-1N • EOS-1N RS • EOS-1V • EOS-1V HS • EOS-3 • EOS-30 • EOS-3000N • EOS-3000N QD • EOS-33 • EOS-5 QD