Topic: Backyard conversion, Canon FD 200mm F2.8 to fit Canon EOS!!
Hi, all, new here. I just bought a Canon XT on closeout, the only way I can afford one. I certainly can't afford new lenses!!! I accidently discovered the M42 and Tamron adaptall "thing" and have been having way too much fun.
I just bought a "dirty" FD 200mm F2.8 Canon on eFray, and did a successful backyard conversion by rebuilding the back mount, to adapt it for manual use on my Canon XT. If anyone is interested, and can steer me to where I can post a few pics, I'll be happy to.
The aperture is adjustable, but is no longer accurate. No big deal with metering, 'sfar as I'm concerned. Just caught a nice pic of a B-17 (YES!) flying nearly over the house. They're going to be in Spokane the next few days.
With my age and increasingly shakey hands, 200mm is at the far reaches of my handholding ability. This Canon is more compact and a lighter than my old Takumar 200mm, and suffers from less flare. The Tak isn't in all that great shape.
Ok, let's try this
This is the thing pretty much done. The adapter is one of the popular import M42 adapters with a focus chip. I don't recommend this seller, the chip is intermittent and troublesome. The separate AF-confirm chip I bought on eFray from "EricC" seems to work fine
This shows the disc I made to adapt the M42 adapter to the lens. The lens "guts" and mount have been removed. None of the original aperture gear or original mount were used. The only hardware used, other than the "main chassis" is the aperture control ring, and part of the mount that it fits on, the middle ring in this picture. Believe it or not, I cut this disc with aircraft snips. I later punched the center hole with a "Greenlee" punch.
This shows the shadetree lever I made which mates the original aperture control ring with the linkage down in the lens. While this does control the opening, and offers full range of the iris, IT IS NOT ACCURATE, but I don't care. I figured out that the sweet spot is about F11, which seems to be "true" F8
This shows the aperture ring on the camera, with the shadetree lever engaged into the lens. The sheet metal ring goes immediately on top of this with original lens screws, and then the M42 adapter is bolted on top of that.
The M42 adapter was drilled to allow the screw heads on the lens side some clearance. If I did this over, I'd try to find flathead screws to fit the original lens, and countersink them into the sheet metal disc. The M42 adapter was mounted with tiny flathead screws and nuts, the nuts simply being manipulated with common angled hemostat, etc
This is all the junk I didn't use. I don't truely understand how these lenses work, and probably won't try another. I bought this lens for not much, but have discovered others on eFray that claim to be in better condition than this one.
Last, here's what flew over the house this afternoon, taken with this lens, set at the sweet spot, on Av with my Canon XT. 200mm is about the limits of my handheld ability, nowadays
Last edited by 440roadrunner (2007-07-24 06:00:46)