RE: [APML] 35 mm Camera & Focuser

["Serge Theberge" <serge.theberge@wti.on.ca>]

John/Bill/George,

Could the Vixen or Lumicon OAG be tweaked somehow instead of changing the
scope configuration? It would be nice if I could do off-axis guiding with
this new scope that I still haven't received yet (although they are
promising that it will arrive by sleigh before the end of December!)

Serge

> -----Original Message-----
> From: astro-photo-bounces@seds.org 
> [mailto:astro-photo-bounces@seds.org] On Behalf Of John C. Mirtle
> Sent: Monday, December 01, 2003 11:13 PM
> To: Discussion of Film Astrophotography
> Subject: Re: [APML] 35 mm Camera & Focuser
> 
> 
> Bill,
>     You are absolutely correct - you could do this. However, 
> this would put the secondary and the bottom end of the 
> focuser 1" further up the optical path. Increased vignetting 
> is the result, hard to say how much exactly but at f4 the 
> light cone is pretty steep. It would also be a bit tough to 
> glue everything together. The OD of the flattener is 60mm, 
> the OD of the Lumicon OAG is 50.8mm. Rube Goldberg  would be 
> proud... :-)
> 
> John Mirtle
> Calgary, Ab. Canada
> 
> ----- Original Message ----- 
> From: "William R. Mattil" <wrmattil@ix.netcom.com>
> To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> Sent: Monday, December 01, 2003 9:25 PM
> Subject: Re: [APML] 35 mm Camera & Focuser
> 
> 
> "John C. Mirtle" wrote:
> 
> >     Not much has really changed then. Herm Perez can 
> probably confirm 
> > this.... As I understand it, there isn't enough back-focus 
> on the R200 
> > to install an OAG. In other words, if you install one, it 
> won't rack 
> > in far enough for the camera to focus.  :- (
> 
> Wouldn't it be rather trivial to move the mirror forward to 
> restore the focus point and accomodate the OAG ? Before I got 
> a low profile focuser thats what I did on my 253mm f/6. Moved 
> the mirror 1" forward.
> 
> Regards
> 
> Bill
> 
> -- 
> William R. Mattil |
> wrmattil@ix.netcom.com | http://celestial-images.com
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