Craig J Marshall
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Yes, I'm using the original C/Y to NEX model, not the later optical design. I did have an original problem mounting the Speed Booster on the E-Mount camera as the back element was out too far but after I loosened the grub screw and wound the rear element in a turn to two to set the back focus, it's now set and forget but no, I have never had an issue changing aperture as there's plenty of clearance....Are you using a C/Y speedbooster to E mount?
I'm not changing mounts, only lenses so my Speed Booster and the camera are mounted together on a custom rail/plate arrangement so there is no chance of movement between the camera and the Speed Booster thus eliminating one potential source of trouble. The original Contax C/Y mount is far from perfect as is say, a P/L mount but given that my centre of balance on the tripod is under the Speed Booster, not under the camera, there's little chance of mount movement during a shot. For heavier arrangements such as when I use the Speed Booster, Mutar 2x and the heavy 300mm f/4.0, then I use a completely different arrangement.