Re: [APML] IC1396 in Ha /Tech Pan

["John C. Mirtle" <spampit@shaw.ca>]

That's it! Thanks Ken, my memory isn't the steel trap it used to be. It was
an article by Ron Potter on some new fangled device called an "automatic
guider", pg 328. Looks like he built a guider using a photomultiplier tube
and with knife edges whizzing around on speaker cones. His shots ranged from
2 to 6 hours using a C14 at f11. That was pretty hi-tech stuff for an
amateur when the book was published, back in 1988!

John Mirtle
Calgary, Ab. Canada

----- Original Message ----- 
From: "Webb, Ken (USF Lakeland)" <kwebb@lklnd.usf.edu>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Thursday, September 25, 2003 8:17 AM
Subject: RE: [APML] IC1396 in Ha /Tech Pan


If my memory serves me (sometimes is doesn't), there was a section in
Wallis and Provin's book that had a 6 hour Tech Pan image taken with a
Celestron 14 and a homemade autoguider. I forget the name of the author,
but the article is in the back of the book. Just look for the section on
autoguiders in the table of contents.
Ken


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