Lens identification - Urgent

Hi all. Please help me out with this one, Just about to buy a Vintage lens as i've heard great things about them but i can't work out what mount it is.....
It is a Helios 44 f2 58mm Zebra pattern. Aparently it was previously used on a zenit camera.

Any ideas if it is M39 or M42?

urbanfreestyle wrote in post #17986917
Hi all. Please help me out with this one, Just about to buy a Vintage lens as i've heard great things about them but i can't work out what mount it is.....
It is a Helios 44 f2 58mm Zebra pattern. Aparently it was previously used on a zenit camera.

Any ideas if it is M39 or M42?

Hosted photo: posted by urbanfreestyle in
./showthread.php?p=179​86917&i=i6567860
forum: General Photography Talk

Hosted photo: posted by urbanfreestyle in
./showthread.php?p=179​86917&i=i219506658
forum: General Photography Talk

It is impossible to tell what size the thread is by simply looking at a photograph. Do you possibly have a caliper handy? If not you can get them cheaply (if you buy plastic ones). I have one I bought from Sears, but you can find them at any hardware store I would think.

M39 would measure 1.535 (just over 1 1/2 inches) and the M42 would measure 1.653 (just over 1 5/8 inch)

To convert metric to inch take 39 divide by 25.4

Good luck!

Thanks, sadly it is online and the person doenst know / have calipers. i THINK it's m39 :-/

As cheap as lens adapters are now I would get both adapters, there are M39 to M42 adapters available for just a few dollars in the U.S., can't imagine they would be that expensive in the rest of the world.
https://www.amazon.co.​uk …ywords=m39+to+m​42+adapter

Yeah, i have the m42 to sony so could pick up the m39 as well haha!

44 is the first and it is M39 if it was on the Zenit.
http://www.zenitcamera​.com/archive/lenses/he​lios-44.html (in Russain).