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Message: <blockquote data-quote="Ultra Lite" data-source="post: 1361227" data-attributes="member: 66653">Unless your DSLR camera adapter is non-standard (which I highly doubt) it does not terminate with a M42 thread but with, rather, a "T" thread.While they both are the same size (42mm) the thread pitch on the T thread is finer:T-Thread (42mm x 0.75mm)M42 (42mm x 1.00mm) - this was designed only for mounting lens' to camera bodys not for what you want to do. I'm quite sure there is no such thing as a M42 to Canon EOS bayonet mount. If such a adapter is required by your camera adapter you have to get it from the manufacturer of your adapter. But I doubt it. The long and short of it is that any 15 buck Canon EOS T ring should work such as this:<a href="http://cgi.ebay.com/T-T2-MOUNT-RING-ADAPTER-FOR-CANON-5D-10D-20D-20Da_W0QQitemZ250338555806QQcmdZViewItem" target="_blank">http://cgi.ebay.com/T-T2-MOUNT-RING-ADAPTER-FOR-CANON-5D-10D-20D-20Da_W0QQitemZ250338555806QQcmdZViewItem</a>Such a T ring is readily available almost anywhere.</blockquote>