Astronomy Site: Meade Advanced Products Users Group Archive: RE: [M]: RE: CCD focus question


 

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Subject: RE: [M]: RE: CCD focus question
From: John Mahony
Reply To: mapug@shore.net
Date: Tue Sep 02 00:32:14 2003

While you're here, how about checking out the Astronomy Book List ?

The amplification factor will depend on the EP focal length and also on the
distance between the EP and chip (increases with distance). I don't know
the equation, but if the distance is a few inches, probably a moderately low
power EP would be enough to get plenty of magnification. EP projection is
pretty powerful.
The focus, even on a star, won't seem as sharp as it does for deep-sky
images done at prime focus or with a reducer. That's just a matter of
magnification, just as with visual.
-John


>
>Kevin,
>I understand. I will try this tonight. What mm lens should I use in the
>light train?
>Ed Registrato
>
>
>-----Original Message-----
>Kevin Wigell
>
>As far as focus is concerned, anything outside the earth's atmosphere is
>effectively at infinity. So, if you are in focus for a star, you are also
>in
>focus for the moon or planets.
>
>More important than differences in distant is mirror shift as the telescope
>moves. So, for best focus, use a mirror lock and a star near the object you
>are imaging.
>
>Kevin Wigell
>www.kwastronomy.com
>
>----- Original Message -----
>
> > Mark & John,
> > Thank you for the answer. Can it be as simple as that?
> >
> > I can get a very sharp focus on a star. I have done that many times
>before
> > for deep sky work. Will that focus setting work for the planets? I
>thought
> > it would be a slightly different setting.
> >
> > What eyepiece do you think I should use? I have the standard set that
>comes
> > with the Meade.
> >
> > Ed Registrato

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