>>2913008I think they're all the same. If anything the coatings on an m42 one would be worse.
As you can see, it's not unusable by any stretch, and this is my very first attempt to use it for anything like this, really, so it could get better with a little refinement of focus and aperture selection, as well as more work to remove the source of that flare.
For scanning slides I may even prefer it, as the lower contrast may help to preserve the highlights.
This is a shot taken WITH the lense, as opposed to scanned with it.