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He sold it a few months ago.

I believe it's an ISCO projection lens. They usually don't have an aperture control so you're gonna have to shoot wide open. You can make a simply whole grab adapter to use it with a Chinese helicoid to focus.

Just flock your scope. There are a few YouTube videos on that.

Lovely videos! Good luck with your sale!

Same concept, you just need to align the front or rear glass to match the other.

Synchro focus has been utilized in both basic DIY, advanced DIY, and even at pro levels (Lomo Squarefront, Kowa Cine Prominar anamorphic, Nipponscope Series I, Dyaliscope, etc) for a long time. Here are a few DIYs

I believe Kowa 16-H and its variants (8-Z, B&H, Elmoscope II) are the best overall. They have the biggest rear element and can go as wide as 58mm on FF 36x24 with very little to no vignetting. The 1.5x and 1.75x are also nice if you want something with less squeeze. Just make sure you get a good copy and/or fine tune the alignment.

It isn't just the front element alone, but also the focal length as well. I believe there are some tests on this in the Anamorphic Shooters group on Facebook.

If it's fixed at something like 4m then you will be able to focus from 4m down to very very close, unless you have a special variable diopter that has both negative and positive power adjustment. I'd say the best way is to modify your scope to achieve inf and lock it there. Then you can use any focuser to focus it from inf down to about 1m.

Bolex/Moller 16/32/1.5x vs Kowa 35 1.5x? Bolex is a lot sharper even at the widest aperture value. The flares can be both purple and blue. Kowa 35 1.5x is quite bigger and less sharp with flares more toward to blue instead of purple. If my memory serves me right, the Kowa has more veling glares (the white vignetting) more than the Bolex due to its front element (and maybe the inner housing paint). Also, it's Kowa 35 1.5x not Kowa C35 or C-35. People (including myself in the past), somehow see Anamorphic-35 as Anamorphi C-35 so we call(ed) it that way which isn't right...

There aren't "focus through" lenses. The lens you have without a focus ring is likely a fixed focus lens. That means they designed it to be focused at a specific distance eg. 4m or inf, depends on the manufacturer. You can, however, move the front or rear element back and forth to achieve different focus point. Check https://www.youtube.com/watch?v=dmMiuMFQSuU for a similar lens.

Looking nice! What's the taking lens and camera?

Group no longer available?

There's a single focus version too, this one https://www.youtube.com/watch?v=Ab7KFtUFv8s Basically it's the 1.33x-40 compact with SLR Magic Rangefinder builtin, non-removable. Also, there are two version of each, the one with near/normal focus distance and the other one with feet scale (they call it Cine, if I recall). Optically they're the same, with just different distance marking and the one with feet scale costs more.

Are you using the version without front vari-diopter? In that case, you need to double focus. Check this out https://www.youtube.com/watch?v=yneSk9wdJWw