question about Russian M39 lens construction

[splitimageview]

Are there any Russian M39 lenses that have a removable mount?

I.e., the back of the lens with M39 thread can be removed, and the mount is not part of the helical?

 

[johannielscom]

Maybe the little 39mm moutn lens for a half frame, that is 28mm focal length? Can't recall what it's called atm..

Or try Paxette lenses, they are 39mm too. Should be cheap.


All Russian RF lenses I can think of are mount and helical in one piece.

Got nice hacking plans? What are you trying to mount?🙄

 

[Crazy Fedya]

Industar 61 does. 3 screws and it should come off

 

[davidnewtonguitars]

Go on youtube, there are some FSU lens cleaning vids.

 

[wolves3012]

Most of the 50mm and all of the non-50mm russian lenses are more complex than a mount and a helical as separate pieces. As pointed out, the Industar 61 (and its predecessor) can have the rear mount and a flange removed. You'll have to be ingenious to mount other optics to the flange though. The Jupiter 8 has a removeable optical block (just unscrews) but that leaves the focussing mechanics behind.

 

[Ko.Fe.]

And so does J-3 and J-12. Block just unscrews at most of them, or it is fixed by the ring, which needs to be unscrewed from the back. I'm working on one earlier J-8 like this.
For certain amount you could mix and match focus part and optic part.
Or you could go crazy:
https://www.ebay.com/itm/LOMO-T-43-...462901?hash=item4674c02fb5:g:9S4AAOSwcN1aX9xJ

 

[David Hughes]

...For certain amount you could mix and match focus part and optic part.
Or you could go crazy...

Hi,

Been there and done that:-

The top photo is a screen capture, when it was being cropped, and the second photo is the crop. I had to sort out the focussing scale with a tape measure and used f/4 because it was the widest. The picture was then taken at f/5.6 to give a margin of error. Obviously, the lens is not RF coupled.

Regards, David

 

[santino]

Nice, Smena and M9!

 

[johannielscom]

Interesting, David.

What mount does that go onto? Can you show some pictures of the whole lens assembly?

 

[ForestCap]

i have a T-43 lens with a butt from industar-50 (the SLR version, but it's still M39), also uncoupled.

 

[retinax]

Share your hacking plans please! I too am harboring dark thoughts of this kind...

 

[splitimageview]

Thanks for everyone's comments...I'm looking to remove the bayonet off of a v3 Summicron 50mm, and replace it with a screw mount. Figured that hacking a Russian would be the cheapest method, although there appear to be some M39 thread adapter options on ebay that might work, with additional machining/shimming of course.

 

[stupid leica]

alright, that is... different? best of luck!

 

[splitimageview]

Being able to use it on my screw mount bodies as well as M mount bodies makes things very flexible. 🙂

 

[Ko.Fe.]

alright, that is... different? best of luck!

Very different. I assume LTM is for film. DIY CLA'd and shimmed 50$ J-8 is very good alternative to Cron on film. IMO.

 

[David Hughes]

Hi,

The T3 40mm seems to be mounted on an Industar-50's back end but it's one of the early Zenit (3m) Industar-50's with the 39mm thread. Then there's a bit of tubing and the T3 fits into that. Nicely done but, obviously, scale focussing. The black lens on the left is from a 1960's Zenit.

I cleverly sorted out where it was focussed and what the scale on the mount said as a "look up" table but cannot find it... The Zenit lens mount is for 39mm x 1mm but scale focussing is for a 50mm lens so obviously wrong.

BTW, the later Industar 50-2 don't seem right for it but there were one or two variations. Anyway, there's plenty of these hybrids on ebay and some very cheap too.

I thought one of the BLIK RF's would match it but don't know what the RF's scales show. So more to go wrong...

Regards, David

PS (Edit) I forgot to say how pleased I was with the little lens. I should have cornered the market in Lomos etc first. You can still pick them up dirt cheaply, say a pound or so as the Cosmic Symbol is generally despised but I think it's clever piece of work. What my mother called "cheap and cheerful" many years ago.

PPS (2nd Edit) I just had a thought, it's a WA lens so not going to be critically focused close up but mostly used outdoors. So I could calibrate it as a zone focussing lens at say f/5.6 or f/8... Just a thought as it will make life lot easier.

PPPS (3rd Edit) A photo has been added...