Helios 44 58/2 M39 mount ?

Hello,

I'm mostly using my NEX-5 for portrait shots. I love my Rokkor MC 50 1.4, but sometimes I'd like to carry something more compact and light.

I've had a look at all the mount adapters for the NEX and I saw that M39 adapters are really tiny.

Then, I had a look at cheap m39 portrait lenses (thanks for sharing guys !), and these 2 russian lenses looked fine :

• Jupiter 8 50/2

• Helios 44 58/2 M39 version

I've read on a forum that the Helios 44 has a different register distance from other M39 lenses, making it sort of incompatible with M39 adapters.

Did someone test this lens with the NEX ? I haven't found anything on this forum (except about the m42 version).

Thanks in advance.