Canon FD extenders 2x-A for lenses 300mm and longer except for the 300/2.8L and 2x-B for the 300/2.8L and shorter lenses, both in excellent condition except for a number engraved on the 2x-B. If you happen to have the 200/2.8 internal focusing lens, that plus the 2x-B makes a nice compact tele for impromptu birding opportunities. In the pictures, the 2x-B is the one with the chrome plate on top and the UC0904 date code on the bottom. I can include one set of caps, so if no one wants both of them, the first paid order will get the caps. $100 for the pair includes domestic US shipping, or $50 for the 2x-A and $60 for the 2x-B. Add $5 shipping for Canada/Mexico. Elsewhere, we'll figure it out.