Astro-Physics 92mm f/7 Stowaway


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Subject: True Field
By: Anonymous (xxx.xxx.214.71)
Date: 07/28/2003 11:33:34 am PDT
The comment of FOV needs correction:

The True Field in the 92mm Stowaway with a 22mm Nagler T4 is NOT 4 degrees. The field stop of the 22mm Nagler is 31.1mm. The focal length of the f/7 Stowaway is actually 604mm (f/6.6) per the AP website. So using the field stop calculation of (31.1/604)*57.3 gives you a TFOV of only 2.95 degrees.

The 31mm Nagler yields a true field of 3.98 degrees.


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Subject: Moved Message
By: Anonymous (xxx.xxx.214.71)
In Reply to: Anonymous (xxx.xxx.27.117) (Original Vote)
Date: 07/28/2003 11:41:39 am PDT
This is a comment only. The post about the 22mm Nagler yielding a 4 degree true field is incorrect for the f/7 model. It's close for the old f/5 version, but not the new version.

The True Field in the f/7 92mm Stowaway with a 22mm Nagler T4 is NOT 4 degrees. The field stop of the 22mm Nagler is 31.1mm. The focal length of the f/7 Stowaway is actually 604mm (f/6.6) per the AP website. So using the field stop calculation of (31.1/604)*57.3 gives you a TFOV of only 2.95 degrees.

The 31mm Nagler yields a true field of 3.98 degrees


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