Here's a brief rundown of how the equipment all comes together.
1. Canon EOS digital camera body.
This can be any standard Canon EOS camera body, in this case an EOS 10D digital camera.
2. M42/EOS Adapter.
This is a metal adapter ring that allows the use of screw mount lenses and accessories on an EOS camera body.
3. Asahi Pentax Bellows.
This is a 1960s vintage bellows that was originally used for macro (close up) photography.
4. Modified M42 12mm extension tube.
This was originally another macro photography accessory. The bellows shares the same mount as the tube, so it screws right in like a lens normally would. I had to do quite a bit of modification to the tube to mount the lens, but it worked out perfectly.
5. Kodak 1-A Autographic Junior Lens and Shutter.
This is an original (circa 1914) Kodak Anastigmat lens and ball bearing shutter asssembly. The lens is in good condition and the shutter still works, although it is a bit sticky. It's attached to the extension tube by the original locking collar that once held it on the lens board of the camera.
6. Focus Knob.
This knob turns a worm gear that moves the bellows back and fourth. This type of lens has no focus mechanism of it's own; either you have to vary the distance of the lens to film plane, or vary the distance of the camera to the subject to achieve proper focus. This knob makes it easy to fine tune the focus of the lens from very close (less than a foot) to infinity. Moving the lens closer to the camera will focus it farther, while moving it away will allow it to focus closer. It actually makes a pretty decent macro lens. Magnification is probably somewhat greater than 1:1.
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