I bought one of those multiple extension tube macros off eBay some years back for $7 where you attach a lens to the tube, and then the tue to the camera. OK, no autofocus (but I always manually focus anyway), but it does the same job. I usually use the old EOS Rebel kit lens as the glass up front - does a fine job!
The other handy part is I can use it on the scope if I need more backfocus - just put the macro tubes onto the T Ring, and then the rear tube onto the camera, and voila! Haven't had to use it yet though.
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