Re: [APML] Tele Vue & Field Flatteners for Refractors?

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

Thank you "Mucho Grande!" Chris,
  This is exactly the type of info I was looking for.  Will Do!  The $265 
version or bust.  Just got e-mail confirmation the scope shipped today.  
Time to find the old ronchi tester, knife edge camera body, and get ready 
for some serious star tests!

Thanks Again,
Jim V.

(Great Luck with your new set-up, that camera interests me also.)


P.S.  Nice to see the list's back up and runnin' too, was beginning to miss 
all my buds a bit.  Thought I'd been un-subscribed!  Highly interesting Mars 
images there too Chuck.  You may be outdoing the JPL guys.  I heard they 
have trouble calibrating due to atmospheric hues.


>From: "Chris Cook" <ccjd@ix.netcom.com>
>Reply-To: Discussion of Film Astrophotography <astro-photo@seds.org>
>To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
>Subject: Re: [APML] Tele Vue & Field Flatteners for Refractors?
>Date: Tue, 3 Feb 2004 18:20:46 -0500
>
>Hi Jim -
>
>The Ranger FF (or 1.1x unit) is a piece of s**t.  I used it back in 1998 on
>the then new TV85.  At the time, it was the only FF TeleVue made.  It
>introduces severe chromatic aberration.  It takes a nice scope like the
>TV85, and turns it into a Tasco achromat...... <g>  Soon after I started
>shooting with the TeleVue scopes, TeleVue came out with the .8x R/F's.  The
>.8x does not introduce any unwanted aberrations and is a very nice
>accessory.
>
>Chris
>
>----------------------------------
>Chris Cook
>Astronomical & Nightscape Photography
>www.abmedia.com/astro
>
>-----Original Message-----
>From: Jim Vineyard <mojjv@hotmail.com>
>To: astro-photo@seds.org <astro-photo@seds.org>
>Date: Tuesday, February 03, 2004 3:54 PM
>Subject: [APML] Tele Vue & Field Flatteners for Refractors?
>
>
> >
> >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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