I just now registered so that I could post/reply to your LX7 lens adapter and filter ideas. You have been most informative, especially about simply buying a 37mm to 37mm adapter instead of the harder to find and more expensive FA1 device. I also wondered if it would still allow the lens to fully close when powered off. I have a bunch of 55mm filters that I'd like to reuse here, sounds like maybe all I'll need is a 37 to 55 adapter. I'll even try putting that 37/55 adapter on the lens first, to see if the lens can fully retract when powered off, then maybe all I'd need is just that 37/55 adapter and the 55mm filter screwed in. Another topic I read further up the list, was if or how much the longer/wider filters will cause shadowing in flash photos. Good thought, will just have to try it and see. It may only be an issue at wide angle shots. I appreciate the great advice here.