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Message: <blockquote data-quote="Paul Corfield" data-source="post: 1675174" data-attributes="member: 19132">I've never seen a DOI in EOS mount plus anything in EOS mount will fetch a much higher price. I just buy them in whatever mount as long as they are cheap and then strip the whole thing down. I posted a thread here a while back on stripping down the DOI which can be seen on this link. <a href="http://www.birdforum.net/showthread.php?t=134826" target="_blank">http://www.birdforum.net/showthread.php?t=134826</a>You mentioned where the barlow fits in - the barlow screws into the Max DSLR so it is quite close to the camera. It has to be quite a way away from the scope to reach focus. This is what governs the length of the extension tube going into the scope.Regarding teleconverters, it is close to the camera but you can also put a macro tube between the camera and Teleconverter which will increase magnification.Paul.</blockquote>