Some calme Adapters pictures:

M42 adapter
Adapters

Picture by realblades
The now guide carenar and an adapter.

Sure, the Nikon F-mount compensated adapter with the
-twelve,-twelve Element OF GRIEF, ABERRATION, AND DOOM!

The D7000 will also meter with that. Heading the AI ridge by hand, you can even make it record the correct aperture to EXIF (focal length arrives from lens configurations). Sweet.

M42 adapter check
Adapters

Picture by hugojcardoso
My M42 to four/three adapter has just arrived! Count on lots of cat and flower pics in the in close proximity to future! :-)