[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

Re: [APML] seagull IC-2177

To: astro-photo@seds.org
Subject: Re: [APML] seagull IC-2177
From: Chris1011@aol.com
Date: Thu, 19 Dec 2002 19:01:35 EST
Reply-To: astro-photo@seds.org
Sender: owner-astro-photo@seds.org

In a message dated 12/19/2002 4:53:10 PM Central Standard Time, bobm@koyote.com writes:

Roland, I have not measured these other than just "eyeball". I just looked over some focus tests with a loupe and I am slightly off from critical focus for the IC2177 shot

You have your work cut out for you. At F3.3, your depth of focus is only .001", and the tube length can easily vary that much when the temperature drops a few degrees.

Roland Christen

Follow-Ups:
- Re: [APML] seagull IC-2177
  - From: "Bobby Middleton" <bobm@koyote.com>

Prev by Author: Re: [APML] 'challenge'
Next by Author: Re: [APML] 'challenge'
Prev by thread: Re: [APML] seagull IC-2177
Next by thread: Re: [APML] seagull IC-2177
Index(es):
- Author
- Thread