So, I don't want a macro lens longer than 100mm effective focal length. Hence, I have the 60mm EF-S for my xxD camera. However, I wanted to try using the 60mm on the 1D... too bad this gets in the way of the mirror box:
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Wait, what is that? Oh, ok:
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Well, I just unscrewed the rear mount (carefully cause the ribbon that connects the rear metal contacts to the circuit board is short and taught) - similar to how we did it with the EF-S 10-22 . Popped off the rear baffle, and mounted it with no interference on my 1D. In fact, that rear baffle is almost useless because there's a nice sized gap between the rear lens element and baffle anyway. So dust and moisture enter very easily regardless.
Now I have this:
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And that photo at the top of the removed rear baffle. Check the EXIF data

I don't think I'll ever sell my 60mm macro now. YAY!