From: Mark Gaffney <markgaffney@me.com>
Date: May 19, 2010 2:03:46 PM MDT
To: Astro_IIDC@yahoogroups.com
Subject: Re: [Astro_IIDC] Tarantula nebula..NGC 6744.. Jupiter
Hi Milton,
I may be a bit stupid but I can`t get my head around how exactly to do this measurement?
All I can think is to measure how far apart the two cameras are on my shipping container. Usually there`s not much "in focus" room for adjustment of the prism angle.
I don`t know how this relates to astronomical distances though? Or to relative spacings of extenders. I know I can perhaps slide the guide camera in & out of it`s port..
I`m trying an Antares Red Dot Finder now incidentally, like I had on my 4SE. It sits in the same shoe to be used by the Kwiq guider.
Mark.
On 20/05/2010, at 5:38 AM, Milton Aupperle wrote:
Mark;
On 19-May-10, at 1:03 PM, Mark Gaffney wrote:
Hi Milton,
I have a 1 & 1/4" extender tube which came with my Mogg 0.3 reducer. I also have two different sizes of 2" type extenders which came with my Meade f3.3 reducer.
I`ll try setting up with them & the DSLR tomorrow on the other end of the yard. That`ll give me an idea of the spacings.
You don't have to "try". As I said before, you can physically measure the difference between the two paths with a ruler /tape measure. If your careful, you can determine how much or little extension you need to within 5 mm.
I really am restricted to about 80 metres with land objects. Then I`ll have a look at the waxing moon ( the temptation is always to start imaging it once I`ve got a fix on it! ).
80 meters works fine. I've done that before with a nearby tree. Your imaging through the same optics so parallax is not an issue, like it would be for aligning a Finder scope and the main scope.
TTYL..
Milton J. Aupperle
President
ASC - Aupperle Services and Contracting
Mac Software (Drivers, Components and Application) Specialist
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