[APML] Tele Vue & Field Flatteners for Refractors?

["Jim Vineyard" <mojjv@hotmail.com>]

Hello All,

  I'm trying to figure out the *real* difference between the "Ranger" and 
"Pronto & TV-85" field flatteners.  Both are described on Tele Vue's page as 
follows:

http://www.televue.com/engine/page.asp?ID=169

  I'd much prefer to use the "Ranger" version, both for price ($84) and 
because it does not reduce the focal length but actually increases it 
slightly by 1.1x.  The thing is, it is listed for use on quote: "the Ranger, 
Pronto and TV-85."

  The "Pronto and TV-85" version costs $265 and reduces the f.l. by 0.8x 
*BUT* is listed for use on ANY brand refractor from 400mm to 600mm.

  I want to use a flattener on a non-Tele Vue brand scope of simular 
aperture, 600mm f. l. with a 2" focuser integrated T-thread adapter.  I 
don't want vignetting, or I'd at least like to reduce it to a minimum on 
35mm film.  This'll be my first refractor since my first-ever scope some 12 
of them ago!  It's a semi-apo.

So can I get away with using the "Ranger" field flattener?


Mucho - Thanks In Advance (M-TIA) for any guiding wisdom, or even an 
alternative brand which might work!


Jim Vineyard
www.deepskyphotos.com

(I'm once again behind some 2 to 3 hundred APML postings and need to catch 
up!  Plus there's that CCD list.  I don't know how you guys do it, fast 
computers and speed reading?)

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