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Re: ATM 1.25" vs 2" diagonal on refractor

To: Jeff Wirs <jwirs@verinet.com>
Subject: Re: ATM 1.25" vs 2" diagonal on refractor
From: Mel Bartels <mbartels@efn.org>
Date: Sat, 04 Jul 1998 10:22:42 -0700
CC: ATM List <atm@shore.net>
Organization: Eugene FreeNet
References: <001701bda759$f8013ac0$e9b52dc7@newmicronpc>
Reply-To: Mel Bartels <mbartels@efn.org>
Sender: owner-atm@shore.net


If the eyepiece is 25mm or tinier, then the actual field of view will be
1.25" or less, assuming 60-70 deg apparent field of view.   If you
intend to use slower eyepieces, then you will need a 2" diagonal.
Somewhere around 40mm, you will have to switch to a larger diagonal and
focuser yet again.

--
Clear skies, Mel Bartels // Programmer/Analyst, amateur astronomer
Springfield, Oregon,     // USA homepage: http://www.efn.org/~mbartels
mailto:mbartels@efn.org  // atm, atm-digest list-owner
Motorize A Dob: http://zebu.uoregon.edu/~mbartels/altaz/altaz.html

References:
- ATM 1.25" vs 2" diagonal on refractor
  - From: "Jeff Wirs" <jwirs@verinet.com>

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