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Subject: [M]: RE: Re: [M] Which focus motor for LX200?
From: Heapy Chris CG
Reply To: mapug@shore.net
Date: Fri Oct 23 00:22:32 1998
|
While you're here, how about checking out the
Astronomy Book
List ? |
You will eliminate mirror-shift only if you lock the mirror down,
perhaps by using the transport bolt. Without this precaution I don't see
any particular advantage to the NGF-S focusser?
Chris Heapy
>----------
>Sent: 22 October 1998 17:44
>To: MAPUG
>Subject: [M]: Re: [M] Which focus motor for LX200?
>
>Thanks to all who replied, including Dan Simpson, Mark Baines and Doc G. I
>think I shall almost certainly go with the NGF-S, to have the advantage of
>no mirror shift combined with the ability to coarse focus manually with the
>focus knob.
>
>Now I am wondering, as I shall be using a flip mirror, and will sometimes
>want to use a focal reducer - would the best order be NGF-S : reducer : flip
>mirror : CCD?
>
>Dr Nigel Puttick
>Great Broughton, North Yorkshire, UK
>054.45N 001.15W
>"Where observation is concerned, chance favours only the prepared mind"
>(Louis Pasteur, in 1854)
>
>
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