Re: [APML] Thoughts on Autoguider Setup

[Sean Walker <vze2c3z8@mail.verizon.net>]

The 201 XT will not work with the GM-8 because the 201 issues commands in
both axis simultaneously, but the losmandy can only do corrections in one
axis at a time, therefore you would be in for a world of headaches and
trailed shots.

Sean Walker

> From: Maurice Toet <mftoet@hetnet.nl>
> Reply-To: astro-photo@seds.org
> Date: Fri, 22 Feb 2002 17:26:32 +0100
> To: APML <astro-photo@seds.org>
> Subject: [APML] Thoughts on Autoguider Setup
> 
> Hi group,
> 
> My local astronomy club has owned a Meade Pictor 201XT autoguider for
> several years. It came with a Pictor 416XT CCD-camera, but has never
> been used because it isn't compatible with the old Celestron C-14 drive
> base. I happen to own a Losmandy GM-8 and would like to try the
> autoguider using it for prime-focus photography with my 150-mm
> Maksutov-Cassegrain. When a reducer is inserted, the focal length of
> this telescope becomes 1350 mm (f/9). I have a 60-mm f/7 guidescope
> (f=420 mm), but don't know if this is long enough to autoguide the Mak.
> Of course I can insert a Barlow lens to extend the focal length to 840
> mm. I've learned that in order to use a guidescope effectively when
> guiding with the eye, the focal length should at least be the same as
> that of the main telescope. Does this also apply for autoguiding?
> 
> An f/9 telescope is not the ideal instrument for deep-sky photography.
> Though it's becomming galaxy-time and would like to record some of the
> brighter examples (M81/M82; M51; M65/M66/NGC3628; Markarian's Chain
> etc.). Although a bit grainy, I think I'm going to use Kodak RF 1000
> film. Any suggestions on exposure times (mag. 6 skies)?
> 
> 
> Kind regards,
> 
> -- 
> Maurice Toet 
> http://www.amateur-sterrenkunde.nl
> 
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