Looking for either; the front element on my 50 Summitar starting decementing, and it's not worth repairing...so I would like to either replace it with another clean Summitar, or take a step up to an early Summicron: a collapsible is fine if it's in good shape, or an early rigid would be okay as well. Don't care about goggles if it's a DR, because I don't shoot up close very much. Wear and tear on the outside is fine, as long as there's no abuse; my main concern is the quality of the glass and correct function.