Dzięki za odpowiedź. Znalazłem ciekawy wpis na innym forum: An illustrated review of some M42-EOS adapters (Page 1) - Manual Lens: Usage - Manual Focus Forum a w nim kryteria do wyboru adaptera:
Oraz kilka opinii na temat czarnych/srebrnych adapterów wyrwanych z kontekstu:- tight fit on camera
- tight fit on lens
- correct thickness (for M42 to EOS: 1,46 mm or slightly below) and perfect flatness
- top of lens at the top of the camera
- stop screw working
- quality material
- NO ring (or ridge) that pushes down the aperture pin
The "blackness" of the adapter is a criteria tho; a shiny adapter in the body MIGHT create internal reflections in the body and lower contrast overall..For the blackness, when the lense is screwed on the adapter there is not a lot of the adapter still exposed to light, but it may be a criteria.Niestety na część pytań nadal nie znajduję odpowiedzi :/it's not difficult to paint internal of 'metal' adapter with a black felt-tip pen