[ATM] RE: A question about angular size at a distance

[tkrajci at san.osd.mil (Tom Krajci)]

>From: "PK" <pkreisle@earthlink.net>

>I would like to print a test pattern out that could be placed
>some distance away from a telescope and use this to be
>a reference to the ability of a scope to resolve a given 
>seperation.  Specifically I wish to compare a few of my 
>and others scopes side by side and compare ability to
>resolve the tiniest increment they can.

>I was thinking in the neighborhood of 100 yards or so in
>distance.  

If you have access to the book:
http://www.willbell.com/tm/tm5.htm
I recommend you look through it.  Telescopes are meant to study objects
at very great distances.  When you study objects at relatively short
distances...the optical performance *might* be degraded.  Much of that
depends on the aperture and focal ratio of the telescope...and the above
book has some info on that to help you determine how far is 'far enough'
for your test pattern distance.

Tom Krajci
Tashkent, Uzbekistan


---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.512 / Virus Database: 309 - Release Date: 8/19/2003