Fisheye lenses, m42 mount

[chphoto]

I'm really interested in getting a fisheye lens to use with my Zenit TTL. Can anyone tell me if such lenses exist (i'm sure they do!) and what the going rate is likely to be? Proper circular fisheye would be best, I want to have a go at mad kiteboarding photography on film!

 

[trencheel303]

There is a thread about wide lenses in M42 mount on film and conventional.

I have a Pentax Lydith 30/3.5 in M42 mount and on FF 30mm is moderately wide, but not fisheye of course.

Good luck finding something...!