Thread-mount lens reference?

[John Celio]

Anyone know of a site with info on Pentax's thread-mount lenses?  Since most 
of the lenses I use these days are thread-mount, it would be great to find 
info on them and others.

More specifically, I recently came across an 18mm f11 Takumar fish-eye lens, 
and I'm wondering how close it focuses at its various aperture settings. 
It's a lot of fun to use on my MX, but less so on my *istD (basically a 
distorted 28).

Thanks,
John Celio
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