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Re: [ATM] modern Herschelian telescope

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Subject: Re: [ATM] modern Herschelian telescope
From: "John Sherman" <atm@mail.johnspics.com>
Date: Tue, 24 Jan 2006 19:45:39 -0500
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Hi Cristian,

> and has two lenses under the secondary.

Sure, that's one place to correct the astigmatism. You can also move the lenses to the bottom of the focuser, and they'll be smaller. You can correct it on the primary (off-axis section of parabola) or on the secondary (like Sasian). Please, let us know how it turns out!

John




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