I have two pieces of gear I've had for a while and would like to sell/trade toward a Rollei 3.5f. Can anyone offer a guideline as to what value these two things might have? One is an old collapsible Elmar 50mm f/3.5, just like the one listed here: http://cgi.ebay.com/Vintage-Early-U...emQQptZLH_DefaultDomain_0?hash=item19b7415a8c - except that mine has a meter scale for distance. Also, I have no front or rear caps. The other is pictured - when focused as shown in the side shot, it is at infinity. It will go up to 1:1, or very close to it. (I'm not selling the camera, just the lens and bellows). The only info I can find on the lens is for LF use, which this lens may be, but I acquired it mounted in this bellows unit, which is adapted for Nikon. The lens has no shutter. (The only part of the lens text on the front shot that you can't read is the word Schneider) I may just send this to KEH in trade, but I would like to have a sense of worth first.