Jupiter 8 on m42?
I'm impressed by the images on the Jupiter 8 thread and as I love the rendition of Sonnar lenses began to think of getting one. However when looking at samples on the auction site it became apparent that apart from a few which are modified e.g. for Nikon, they're all ltm m39 thread.
This raises the question of compatibility for m42. The flange-film plane distances for the two standards are different - 45.2mm for m39, and 45.46 for m42. Granted the difference is small - 0.26mm - but I would have thought this is significant, especially at large apertures and close subject distances. What do people think? And are any of you using J8s on m42? Appreciate any comments.