Re: Tell me if i am wrong in using an "CRAYFORD" Focuser
Thank you, vvoice, but i know how to measure the focal length of the
scope (just measure the distance from the primary and the secondary
mirror and that´s it it´s more difficult than it seems) and i know
the F/x that the Meade put in the scope, so i have to put the scope
in my case in the F/10 (3048mm) and use an "CRAYFORD" focuser to keep
that distance and of course the image shift.
You will think that i am nuts but if someone create an scope with
F/10 (and at that mark he garanties the diffraction-limited why i
will use the f/8 to f/12 )?
Thank you for your time
--- In Meade-Uncensored@y..., "vvoice" <vvoice@m...> wrote:
> I am not an expert on this by any means, but most of the usage that
> heard of for this is to reduce image shift. From what I know of
> optical design, there is an optimal distance for image quality
> primary and secondary mirrors. But I don't know how you would
> calculate what that distance was, nor determine when the primary and
> secondary mirror separtion distance was at this length. Would be
> if anyone has ever done this.
> ----- Original Message -----
> From: <m@...>
> To: <Meade-Uncensored@y...>
> Sent: Monday, July 30, 2001 8:31 AM
> Subject: [Meade-Uncensored] Tell me if i am wrong in using
> > Hi,
> > I want to know if i am wrong about an "CRAYFORD" Focuser.
> > In my oppinion, this focuser, coupled in a SCT, is use in 70%
> > for keeping the F/x (focal lenght) of the telescope and 30% for
> > shift image.
> > Can anyone help me?
> > Thank you for your time
> > waspinmotion
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