On Monday, 28 May 2018 06:54:24 UTC-4, Quadibloc wrote:
On Friday, May 25, 2018 at 11:41:18 PM UTC-6, Chris.B wrote:

A fixated market corrupts absolutely.
Just ask iRottenApple.

Brandon eyepieces. On screw threads. Oh, yes. Don't get me started.

John Savard

Just like Brandons, some cameras had screw-mount lenses. Back in the 1960's...