Hi Mike,

There are two versions of the Paracorr. The one that I have has T-
threads for attaching a standard 35mm Camera. The optional items
available are the tunable top and 2" to 1.25 adapter which convert the
photographic Paracorr into a Visual Paracorr. The other version is the
"Visual Only", which is a complete unit with a larger field lens and
no T-threads. That model was designed for those with a Nagler 31mm, as
apparently some vignetting can be seen with the 31mm in the
Photo-Visual model. The heart of my cocern is, how noticeable is the
vignetting, and is it bad enough that I should get the visual-only
model, or is it subtle enough to let me use trhe model that I have.

Cheers,

- Craig

Craig Levine
***********************
I have the older version Paracorr, and i never noticed any vignetting, with my
31mm Nag! But then again i never looked for vignetting. But i will try it out
next time i get the scope out...

Chas P.