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Re: [ATM] FW: Secondary Cage Calculations

George,

Exactly.

A is approximately the focal length of the primary mirror.
2 * tan(AFOV/2) * A then equals the size of the field stop of the
eyepiece.

So you too have derived: ring ID = Aperture + field stop of eyepiece

The maximum field stop is only limited by the size of the focuser.

Robert

> -----Original Message-----
> From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On
Behalf
> Of Geogre Nikolidakis
> Sent: maandag 8 oktober 2007 16:20
> To: atm@atmlist.net
> Subject: [ATM] FW: Secondary Cage Calculations
> 
> 
> I know I am new to ATM forum but applying some Geometry
> I found this formula.
> Ring ID = Aperture + 2 * Tan (AFOV/2)* A
> Where A= distance from top ring to primary mirror.
> 
> George Nikolidakis


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