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Re: [ATM] convex secondary

To: Jonathan Lavoie <atm@atmlist.net>
Subject: Re: [ATM] convex secondary
From: Richard <cnc@cncservo.co.uk>
Date: Mon, 28 Feb 2005 13:40:00 +0000
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Reply-To: Richard <cnc@cncservo.co.uk>
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Hi Jonathan,

Sunday, February 27, 2005, 7:04:55 AM, you wrote:


JL> I know the radius of curvature for the 4 inch secondary
JL> will be 34.5 inch and I know that it has to be an hyperbola
JL> but I didn't find the amount of correction that needs to be
JL> done.

The figures you give suggests that the focal plane is 2" in
front of the primary. If you are sure that is what you want then
the secondary needs a conic constant K = -4.000

-- 
Best regards,
 Richard                            mailto:cnc@cncservo.co.uk

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References:
- [ATM] convex secondary
  - From: Jonathan Lavoie <atm@lavoielactee.net>

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