Fabricating An Adaptor For Canon EOS Lens Use on A SBIG STV Camera
Notes by Gary Vander Haagen, Ann Arbor, MI; garvh@att.net
Fabricating An Adaptor For Canon EOS Lens Use on A SBIG STV Camera
Notes by Gary Vander Haagen, Ann Arbor, MI; garvh@att.net
STV with Tamron 200 to 400mm f 5.6 zoom lens. A standard 2X Tele-Converter can also be added to make the lens 800mm.
Fabricating An Adaptor For Canon EOS Lens Use on A SBIG STV Camera
If you are a photographer with a 35mm Canon camera that uses the popular EOS series of lenses, you may find it useful to use the lenses with the SBIG STV CCD camera. These lenses offer a myriad of possibilities for the e-finder, tracking, solar studies, and excellent wide field astrophotography applications.
While the Canon EOS lens adaptors are not always available from the manufacturer it is quite easy to build an adaptor from aluminum bar stock and the lens-mounting ring from an old 35mm Canon camera body. The mounting ring can be obtained from a camera repair shop salvaged from an EOS series camera body that is no longer serviceable. The ring, leaf spring, and mounting screws are required. While the above design does not use the lens-locking pin it is a simple modification to add that feature.
The adaptor is machined out of aluminum. Alloy 6061 was used but is unimportant as long as you are not going to anodize the part. The STV nose adaptor supplied with the CCD camera is fit to a 1.25 nominal diameter hole and cutoff flush with the 0.31 dimension. Set screw holes are tapped to hold the STV nose in place. Pockets are milled into the ring’s mounting face to allow for clearance of the three leaf springs. Four appropriate size holes are drilled and tapped for the ring attachment screws. Check the thread size of the screws used with your ring. Any EOS compatible lens can now be used with this adaptor.