I just snapped this up on eBay (had to outwit the other snipers heh)... the FL and F specs seem OK, but I couldn't find a good calculator to see what the FOV would work out to... Can somebody help me out, what's the diameter this thing can see?
Buhl Optical Lens NO. 689-12.5, F: 3.3, 12.5 in E.F.L.
The diameter is ~4", and I'm guessing the 12.5 in means 12.5" FL?
I'm hoping I didn't inadverdantly pick up a CRT Projector lens!
Here's the closed auction link, with a few pics:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7512241468
Buhl Optical Lens NO. 689-12.5, F: 3.3, 12.5 in E.F.L.
The diameter is ~4", and I'm guessing the 12.5 in means 12.5" FL?
I'm hoping I didn't inadverdantly pick up a CRT Projector lens!
Here's the closed auction link, with a few pics:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=7512241468