I don't want a eyecup, just a thin, round ring that'll screw into the eyepiece. The ones for the F3 are too big, and all the rest I've seen are for digital. Thanks!
I took a look on eBay and couldn't find any of the eyepiece rings you're looking for. There's a guy local to me that sells this sort of stuff. The closest he gets is eyecups, though. So if you can't find what you're looking for, maybe take AgX's advice. Here's the listing for this guy's eyecups: eBay # 160996751414
I don't want a eyecup, just a thin, round ring that'll screw into the eyepiece. The ones for the F3 are too big, and all the rest I've seen are for digital. Thanks!