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MD and MC couplers



I am a newbie to this site and still pretty green when it comes to photograghy, so this may be a painfully obvious question to you pros out there. least I hope it is to someone.

I have an X-700 and I just purchased a Samyang 500mm telephoto lens. This particular lens fits well onto the camera but doesn't touch the MD and MC couplers. I use aperture priority mode usually, and I've taken a few pics and haven't noticed anything out of the ordinary happening. Am I going to get an unpleasant surprise when I get these photos developled? Just how important are these couplers to the inner workings of the camera and film?