Source for single element optics?

[Dan Fromm]

Edmund's outlet is Anchor Optics. www.anchoroptics.com

[djdister]

Years ago there were some super deals on, for example, Metrogon lenses for $25. I got a mess of them, two in very cool high speed shutters. I mention this to remind others that you can call or e-mail them for items you do not find. That's how I got the shutters.

That's even cooler, will have to check them out...

[Tim Layton]

I get mine from surplus shed.