fish-eyes: Sigma or Zenitar?

[Reg Wiest]

I�m pondering buying a not-too-costly fish-eye lens as it will not be used a
great deal. However, I would like something capable of producing sharp
8X10-inch prints and, once in a while, an 11X14. Does anybody know how good
the Sigma F2.8 multicoated Sigma XQ filtermatic lens is? I believe it�s a
1980s lens. Perhaps, I�d be just as well off to buy a new Russian Zenitar
lens??? Does anybody have experience with either of these lenses?
Thanks,
RW