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Old 18-01-2013, 01:19 PM
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naskies (Dave)
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naskies is offline
Join Date: Jul 2011
Location: Brisbane
Posts: 1,865
Geoptik makes them:

Here's another one for M48 (you could use a step down ring to M42):

Several CCD manufacturers make them tailored for their own cameras, e.g. SBIG for their ST-8300 (I have one of these):

Peter Tan in Hong Kong used to stock some very cheap adapters; not sure if he still does.

The main thing is to make sure that you can get the correct ~ 44 mm (EOS) spacing between the lens and the CCD chip. First step would be to find out what the minimum back focus requirements of your 237A is.

Hope this helps!
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