Last week I came across a Schneider Componon-S 2.8/50 lens, as seen below, with an interesting adapter attached that I had never seen before. I’ve seen lots of v-mount Componon lenses with thread mount adapters attached but this is first one I’ve seen with the female extension tube and lock ring included. So the combination of v-mount thread adapter and tube are a functional lockable focus mount. My bid was the only one made so I was able to pick up the set for a lot less than any of the parts would have cost as new. I’m sharing this information here since I had since I had never seen it I though some might have interest in seeing something like this.
This is basically a variable extension tube that can be used as a focus mount that converts a standard V-mount (V38) to a common thread mount (M42). When locked down the ring makes this setup rock-solid . The ring and aperture lock set screw make this setup resistant to any inadvertent changes due to a bump or nudge.
This exploded view gives you a good look at the setup. Left to right.
Componon-S 2.8/50 lens - external V38 V-mount
V-mount to thread adapter - internal V38 > external M45 threads w/ lock-ring
Thread adapter - internal M45 > external M42 x 1 threads at the back
Note: 45mm x 0.75mm is most famous for being the preferred mount for Rayfact used on lenses like the 95mm and 105mm Printing-Nikkors. Also Linos/Rodenstock uses on the front of the Linos/Rodenstock Modular-Focus units.
Verdict:
Highly recommended!
Schneider Makro-Iris lenses with thread adapters are easy to find on eBay, mostly from sellers in China (with prices marked up 200-300% or more), but if you keep your eyes open you can find complete setups like this from industrial sellers in the US that are solid buys.
Any questions or comments feel free to send me an email.