Re: ATM Newt...

[Shane_Lapierre@aici.com]

My secondary on my 8" f 5.5 is almost 30% the size of my primary, and I
would challenge any other newt to a planetary show-down... I might lose,
but I don't think it would be because of my secondary size.  I get great
planetary images.  You need to configure your scope to the way you'll use
it most, and since it's a multi-purpose scope you want to be able to have a
decent sized fully illuminated area.

Shane LaPierre
http://www.geocities.com/stellar1972





Xakxak@aol.com on 08/22/2000 09:03:07 AM

Please respond to Xakxak@aol.com

To:   richas@idt.net
cc:   atm@shore.net (bcc: Shane Lapierre/CT/AICI/US)
Fax to:
Subject:  Re: ATM Newt...




In a message dated Mon, 21 Aug 2000  1:23:41 AM Eastern Daylight Time,
"Richard Schwartz" <richas@idt.net> writes:

<< > According to Newt the Angular FOV for the 100% illuminated area is
0.4004
degrees.  The diameter is 0.5075".  Angular FOV for the 75% illuminated
area
is 1.079 degrees.  The diameter is 1.368".
>      I don't understand.  Is this good?

It all depends what you are going to be doing with your scope.    .5075" in
the focal plane is too small for variable star observing and prime focus
photography.  It is probably a bit too large for high power observation of
planets, the moon, and double stars. >>

     Well, I am just using this scope for visual observing right now.  How
can I optimise the size of the focal plane so I can look @ planets with
high power and also use low magnifications as well.  Does it all depend on
the secondary size and focal ratio of the primary?
-Pete









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