TSRED279 arrived this morning and I have done a crude initial test with some fixed spacers that gave me 74mm Backfocus with my aps-c Hypercam 26c attached. Just been doing some daytime work and am very pleased so far. In particular illumination is flat, to the eye, into the corners so I believe TS claim that it is good to 30mm.
Using the 2in plug fit for now and will see if I can set up a screw fit. Will report back when I've had a chance to play on a proper target.
Edited by UKalwayscloudy, 05 May 2021 - 08:41 AM.