Re: [APML] Borg Astrograph 125 F2.8

["Volker" <volker@spiegelteam.de>]

Hi all,

> Also, I believe that Pentax has an excellent 400mm
> f/4 astrograph (SDUF?). I believe Volker Wendel among others uses one.
> Perhaps he can give you some information on it as an alternative.

yes, I used both version, SDUF I and II.

The older version (I) has a bad blue correction which caused me to stop
using it for CCD-photography in Namibia the first night. There were hugh
blue halos visible across the field. I then switched to the lastest model
(SDUF II) which shows these halos too, but they can be handled with some
photoshop techniques (take a look at this special example:
http://www.spiegelteam.de/ngc3576.htm ).

Of course, CCD is much more a challange for the optics than film
photography. For film photography, the SDUF I is acceptable, here is one
result with it : http://www.spiegelteam.de/antaresr.htm

Some more shots can be found here: http://www.spiegelteam.de/namibia.htm

BTW: I would be very interested in getting a few to a ST10 shot with that
Borg at f/2,8!

Clear skies,
Volker
www.spiegelteam.de



> ----- Original Message -----
> From: "Jens Christian Sorensen, D.C." <CQSQUIRO@telefonica.net>
> To: "AstroPhoto" <astro-photo@seds.org>
> Sent: Sunday, November 30, 2003 10:49 AM
> Subject: [APML] Borg Astrograph 125 F2.8
>
>
> > I do not write a lot to the list - not because I do not have the need,
> > not because I have no questions. Mostly because you guys just blow my
> > mind with your elevated standards.
> >
> >
> > As a beginning astrophotographer, most of your photos to me just seem
> > untouchables.
> >
> > Just a little about my setup.
> > Dob riding on top of a equatorial platform
> > Pentax 6x7 camera with 105 mm F 2.4, 165 mm F 2.8, 300 mm F 4.0.
> > 35 mm camera Ricoh KR5 with 400 mm F5.6
> >
> > Until now I have been using piggyback setup for the pictures, and have
> > done quit nice with my modest self-built setup. But time has come to
> > move on to something more challenging.
> >
> > I have see that some of you are using the Borg 125ED f2,8 astrograph.
> > Would you be able to comment on it. Of cause - a picture is worth a
> > thousand words, and I have seen the pictures that are on the list -
> > especially those made by Garth Buckles.
> >
> > Thank you,
> >
> > Jens Chr.
> >
> > http://personal.telefonica.terra.es/web/jcspage/
> >
> >
> >
> >
> > _______________________________________________
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>
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