Upload & Sell: Off
I just got a C/Y-NEX Speed Booster, but it's got some issues. It doesn't allow any of my C/Y lenses to focus to infinity, but that's fixable and something I expected given the comments here.
The bigger issue is that the fit with some of my lenses is very poor. My S-Planar 60/2.8 and Sonnar 85/2.8 do lock, although they have a small bit of play. Neither of my two Planar 50/1.7 locks though, and simply turning the aperture dial will unscrew the lens from the SB. This is a big issue since the Planar 50/1.7 is the main reason I bought a SB. I used to have similar issues with a cheap adapter (though not as bad) which caused me to get a Novoflex adapter instead, and with the Novoflex all of my C/Y lenses locks firmly in place.
Anyone have any ideas for how to fix this? The issue seems to be the weak locking mechanism (compared with the Novoflex), which means that it's likely a design issue and not a manufacturing issue. So getting the SB replaced probably won't solve the issue. I also have a Yashica ML 50/1.9 which fits very securely on the SB, and it almost looks like it might be possible to swap the mounting plate with the Planar 50/1.7 to create some kind of franken-Planar. The Yashica seems to use those pesky JIS screws though, so I'd need to get some JIS screwdrivers before testing that plan.
Edit: After playing around a bit it seems like it's actually possible to get the Planar 50/1.7 to lock if I jiggle it around a bit. The keyword here is "jiggle" though, which is only possible since the fit is so loose. So even when it locks it's still very loose, which kind of ruins the nice feel of using the lens.