Mir 3V

Hi, I've just received a Mir 3V lense for my Saliut-C, and i was wondering if someone could indicate me how to use it. My problem is that the "diaphragme" opening is somehow quite hard, and I'm yet to understand the purpose of the little "locking" wheel near to the closingt indication.
Thanks in advance.

Sovietic collection - http://www.flickr.com/photos/pauldurke/

Hi Paul,

Can't tell anything about your lens.
For me, it's rather Feds or Kievs (and Leicas/Contaxes!).
But many thanks for your pictures: some really "speak" to me.
I never used a Lubitel: I will try soon!

Amitiйs. Jacques.

Ok, thanks for viewing my "work", feel free to comment though :) !
I will post some shots with the mir lenses as soon as my Saliut is repared !

Sovietic collection - http://www.flickr.com/photos/pauldurke/