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Re: ATM collimation?

To: <atm@shore.net>
Subject: Re: ATM collimation?
From: "Mel Bartels" <mbartels@efn.org>
Date: Sat, 23 Aug 2003 08:59:13 -0700
References: <1061627816.0a175dee63d3c@think.localshops.org>
Reply-To: "Mel Bartels" <mbartels@efn.org>
Sender: owner-atm@shore.net


> noticed that the secondary shawdow was off.  I don't think I ever noticed
that
> before.  Off center in ONE direction only.  How can that be?  I tweeked a
> little and the image got even better.

1. diagonal too small when racked out
2. focuser bending or flexing, either in entirety or the collimator in the
holder ring
3. you can rack further out than in, thus any mis-collimation is more
noticeable when racked out
4. collimator vignettes the diagonal

Mel Bartels

References:
- ATM collimation?
  - From: hermit <hermit@outofoptions.com>

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