I'm hoping to get my M8 back from the Leica repair center in the next couple weeks and am looking to pick up a fast 50mm lens. I've been primarily looking at a version 4 Summicron, but then I was thinking, "Why not consider an LTM lens with an adapter?" I'm not sure any of my reasons are even valid now that I think about it; I've acquired the following impressions over the past couple months, while I've waited for my new M8 to undergo repairs: 1) Older LTM lenses are less likely to be sharp than newer lenses. 2) LTM lenses with an adapter will add more bulk that a bayonet mount 50mm Summicron or Summarit. 3) An LTM lens has a lesser chance of being calibrated to focus correctly with an M8. My biggest concern is 3) that an LTM lens is less likely to focus correctly. I definitely want whatever lens I get to focus sharp wide open. Are there lenses to avoid, given that concern? I'm wary about buying an LTM lens because there aren't many used ones to be had locally, so I would likely end up buying something from the forums or eBay (without a return policy). But is this a valid worry? Are points 1) and 2) above at all accurate? I've been looking at images of some LTM-->M adapters online, and they don't seem to add much bulk at all, from what I can tell. I don't care about the lack of 6-bit coding on the adapter, as it shouldn't matter for a 50mm lens. Any advice here is much appreciated. Should I stick with newer M-mount lenses? Or are there some good deals to be had, without compromising focus, if I'm willing to use an LTM adapter? Thanks!