Re: [APML] JMI Easy-align

["Richard Kellogg" <rkellog1@twcny.rr.com>]

I do not have experience with this product, but read the JMI website
explanation.  I do have the Losmandy polar alignment scope, and am familar
with its use.  As best I can tell, the JMI is similar, with the same
performance issues.

Your polar alignment accuracy requirement is a function of how long your
exposure is.  A 3 arc min polar alignment error on a 50 min guided exposure
results in the same field rotation as a 15 arc min error on a 10 min guided
exposure.

The accuracy achievable with the polar alignment scope is not as good as
with drift alignment, but may be good enough, depending on your
requirements.  I suspect if you took a poll, most people would say you still
need to drift align.  But the polar scope is still usefull, as it gives a
good starting point to do the drift alignment.

For reference, I can polar align using my polar scope to an accuracy of
about 5-10 arc min in less than 1 min.


Rick Kellogg



----- Original Message -----
From: <KDK1044@netscape.net>
To: <astro-photo@seds.org>
Sent: Thursday, December 20, 2001 3:14 AM
Subject: [APML] JMI Easy-align


>   JMI claims that after you drift align one time and lock in the
easy-align, you will never have to drift align again.  Has anyone had any
experience with it? Does it really eliminate the need to drift align each
time you take astrophotos?
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