Strange experience - I bought the 12mm 2" Wollensak eyepiece that was on sale last week at Surplus Shed. It arrived today and gave some nice views with my Jaegers 5" f/5. But there was a bit of a rattle, so I looked more closely. Turns out that the 2" housing surrounds a (repurposed?) C-mount CCTV lens - a Computar 12mm f/1.2, mounted in reverse (also sold as a separate item by SurplusShed)!. Screwed right out by hand - the lens has a diaphram and focus ring! After making sure that the diaphram was wide open, I put it back together (focused to nearest focus to give better position for the telescope R&P).
Raises the interesting question - which came first, the Wollensak or the Computar?
Edited by stevek1, 30 June 2020 - 12:16 AM.