Re: [APML] 1st BRC mosaic: heart & baby

["Steve..." <swalters@worldnet.att.net>]

Jon,

I've checked my collimation every year for three years now and so far it's
looked exactly the same, no shift at all. It's not collimated perfectly but
it is close enough that I'm not planning on touching it. The diffraction
pattern looks very symmetrical and I see no problem with the images.

On another related point, I now want to clean the optics and I'm figuring
out how to do that without removing them. There's 3 years of dirt on them.
Any suggestions on this? So far, I plan to just remove the flattening lens
and dew shield tube. Then go at it the primary with alcohol and swabs. I
haven't checked the secondary yet but I suspect it's cleaner than the
primary. If it needs cleaning, I'll try to do that "blind".

But no way will I remove the optics.

Steve...

----- Original Message -----
From: "Jon Kolb" <jkolb@datawest.net>
To: <astro-photo@seds.org>
Sent: Sunday, November 17, 2002 10:23 AM
Subject: RE: [APML] 1st BRC mosaic: heart & baby


> Hi Bobby,
>
> > I also had some film flatness issues that can be seen at
> > higher resolution, and there's still the collimation to get
> > right. I have a collimating telescope on the way for the BRC
> > now. Anyone who has experience in collimation with one of
> > these please e-mail me. (Steve, Loke--you guys adjust yours
> > any yet?) The mosaic is 2 frames; each being a 2 stack of
> > E200 (60 min) and a single 50 min TP exposure. Comments and
> > thoughts welcome. Bobby Middleton
>
> Great shot, Bobby.  Lots of detail in the nebulae.  I recently picked up
> the Hutech vacuum back for the 67, and it seems to work just great.  No
> more smeared stars on some shots.  It's also a heckuva lot less
> expensive than a full-blown vacuum camera like the Mitsuboshi.  Cutting
> out the paper backing on a 120 roll in a changing bag is not that hard,
> either.  You might think about this approach to cure the film flatness
> problem.
>
> Sincerely,
> Jon Kolb
> Adventures in Astrophotography
> http://home.datawest.net/jkolb/
> jkolb@datawest.net
>
>
>
>
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