Converted 85mm f/1.2 breech to EOS (Canon30D)

Started Aug 23, 2008 | Discussions thread
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jrmcvey Forum Member • Posts: 53
Converted 85mm f/1.2 breech to EOS (Canon30D)

After seeing all the beautiful bokeh coming out of this forum, I decided to buy a 85mm f/1.2 Aspherical from ebay and try a "lens" conversion. I had already done this once with an older (and cheaper) 55mm f/1.2 FL lens, so I felt it was not too risky to try it on a $500 lens. Attached are a few photos for your review. Included are some of the machining operations on my lathe to remove enough of the lens body and FD mount, so I could replace it with a thinned EOS t-mount and still hit infinity focus. (FD lenses have 42mm of back focus -- EOS cameras require 44mm, so that 2mm has to come off the lens body.) I haven't mounted a focus confirmation chip yet, so these early shots are manually focused on my 30D with the stock focusing screen.

Some of you may ask "why" ... it's because I enjoyed the challenge and love working in the machine shop ... but don't ask me to do one for you. There were times I was pulling my hair out ... like when one of the f/stop ball bearings rolled off somewhere in the kitchen ...

The flower images are "out of camera" with no processing other than a downsize for this posting.

John

 jrmcvey's gear list:jrmcvey's gear list
Panasonic Lumix DMC-GF1 Panasonic Lumix DMC-G6 Panasonic Lumix G Vario 14-45mm F3.5-5.6 ASPH OIS Panasonic Lumix G Fisheye 8mm F3.5 Panasonic Lumix G Vario 7-14mm F4 ASPH +8 more
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