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Hi folks I'm trying to purchase either a 13 blade (silver) or 8 blade (black) Helios 44 lens, both M42 mount. Other than the shape of any bubble bokeh (13 blades would be more smooth), any other major difference in photo? I believe the lens configuration is the same so the overall color and...

Hi folks, I am thinking of buying a Russian PO3-M3 / RO3-M3 cinema lens and attach it to a digital camera (Sigma FP or Pentax K70). The seller told me it has a KONVAS mount. How do I attach this to a modern digital camera? I have an OCT18 adapter but it does not look like it will fit. Do I...

Thanks Brian, that is great advice! I live in Japan, and many of the boards here have nightmares where it took hours, literally, to reassemble this part of the lens. I will pass on your good workaround. Komuras are not so popular in Japan as it is outside, it is a shame as they made good stuff...

I joined this forum specifically to check this thread out! I have the same exact lens, all perfect except a very stiff focus ring. I am tempted to tear down and grease it up, but I have heard the helicoid reassembly is trial and error and difficult. I'm not a lens repair expert, and wondering...