Muggins
Junk magnet

I think the vignette is that the hole in the body cap that I put the pinhole over isn't big enough (thoughts on how big it would need to be to get full frame coverage on a Leica body welcomed), or need to be further from the film plane.
The radiating light effect, however, has me beat. I can only assume it's an internal reflection from inside the pinhole (made from an old soft drink can), but it seems to do it in all lights - this was taken late on a very misty evening. Does anyone else have more clue than me what's causing it?
Thanks,
Adrian