I have been testing my MIR-10A 28mm f3.5 Macro lens for a while now. Its a really heavy lens with a pound of glass, M42, and preset aperture. My sample was made in 88 but has a moderately scratched front element. (Hairline Scratches)
None of that is affecting the images I am getting out of it!
Film Used: Fomapan 100 in D-76
Camera: Zenit Automat
I did some color shots earlier with the MIR-10A on a Zenit 19 in Washington DC. Film: Kodak Gold 200
Minilab Processing at Target....they dont care a bit. Sadly.
Some nice results with that lens. I especially like the fourth BW image.
And no, minilabs don't care. I gave up and now send my stuff to an expensive "pro" lab. The cost hurts a bit but less than finding some herbert in a drug store has scratched my negs.