Astronomy Site: Meade Advanced Products Users Group Archive: Re: [M]: 9mm illuminated reticle FOV


 

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Subject: Re: [M]: 9mm illuminated reticle FOV
From: Mark Baines
Reply To: mapug@shore.net
Date: Tue Jan 19 11:37:00 1999

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


>I created a spread sheet in MS Excel under Office 97, to calculate
>eyepiece characteristics.
Thanks.
I have my own spreadsheet but I didn't know the apparent FOV of the 9mm
illuminated reticle EP to calculate the true FOV. Related to this is the fact
that the field stop aperture is very small, smaller than the 9,7mm Plossl
for instance.

>Acording to my data your scope should yield a mag of 282X
This assumes a focal length of 2540mm which is what you get if you multiply
10" by f/10. However Meade always claims the focal length to be 2500mm. Why
that is I don't know.


Mark

--
|| Mark S Baines
|| Inver, Scotland
|| http://www.stsd.demon.co.uk/linnhe.html



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