Originally posted by Zygonyx
Thanks for the pictures and (apparently very peculiar and hard to find) references too.
I am waiting for a Pentax Cosmicar 1/3" C mount 3.5-8mm f/1.4, just hope it's not wasted bucks...
Uh oh. Do you mean this lens:
PENTAX C70319 CCTV Lens
There are 3 problems with this lens.
It's a 1/3" lens. That won't cover the 1/2.3" sensor without vignetting.
It's a CS lens, not a C mount lens. That means it's designed for a flange depth that's 5mm shorter. It might still work but it will act like a lens on an extension tube. So greater magnification and closer focusing, but maybe losing infinity focus.
It's a DC iris. That means the aperture is controlled electronically. If there's no manual override, you may have a problem.
You really want to look for 1/2" lenses or bigger, C-mount, with manual iris and manual focus.