RE: [APML] Help! Advice on collimating a C14

["Steve Barkes" <sbarkes@comcast.net>]

Andy,

One other thing to consider is that the C14 is looking through a lot bigger
column of air than a smaller scope.  The seeing needs to be excellent to
produce good planetary images with that much aperture.  I have a 10" LX200
and I'm only able to push it to F30 on 2-3 nights per year.  And perhaps
only one of those will be really good.  The last one was December 26th,
2002!!  If your DSO images are good, but the planetary images are bad, it
may just be a matter of seeing.

Also, make sure you collimate in your imaging setup.  Don't collimate with a
diagonal in place, and then remove it to attach the camera.  Try final
collimation with the imaging camera after getting it close with an eyepiece.

Of course having few opportunites for good seeing means that collimation is
that much more important.

Steve Barkes
Las Cruces, NM 

-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org] On
Behalf Of Andrew Clegg
Sent: Tuesday, November 30, 2004 6:02 AM
To: Discussion of Film Astrophotography
Subject: RE: [APML] Help! Advice on collimating a C14

Hi Gene,

I had seen this site, and I agree, it's the best one. I have followed its
advice, but still no luck on getting good images. The degradation in my
images are consistent with the uncollimated images that are simulated on
this web site, only worse. I would kill to be able to see Saturn through my
C14 looking as good as the right-hand image at the top of this page! I will
be following everyone's suggestions and making sure everything is tightened
down on the 'scope the next time I attempt collimation.

Clear skies,
Andy


-----Original Message-----
From: astro-photo-bounces@seds.org
[mailto:astro-photo-bounces@seds.org]On Behalf Of Gene Horr
Sent: Monday, November 29, 2004 8:58 AM
To: 'Discussion of Film Astrophotography'
Subject: RE: [APML] Help! Advice on collimating a C14


This is the best source on collimating SCTs:

http://perso.club-internet.fr/legault/collim.html

Just slewing from one side of the sky to the other is enough to lose
critical collimation for most mass market SCTs.

Gene Horr


-----Original Message-----
From: astro-photo-bounces@seds.org [mailto:astro-photo-bounces@seds.org]
On Behalf Of Andrew Clegg
Sent: Sunday, November 28, 2004 11:29 PM
To: Discussion of Film Astrophotography
Subject: [APML] Help! Advice on collimating a C14

Gang,

This may not be the best place to ask this question, since everyone seems to
use RCs or refractors, but I thought I'd ask anyway...

I have a C14 CGE, and I am having one &$%#^ of a time getting the thing
collimated.




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