Re: obstructed view?

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Article #3841

#3841

From: Phil Fischer
Date: Wed, 13 Jan 1993 01:18

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In article <1ivb92INN974@falcon.natinst.com> butler@natinst.com (Paul Butler) writes:
>It seems that people prefer refractors for viewing the planets, but are
>willing to use a telescope with an obstruction (e.g. Newtonians) in
>order to gain aperture when viewing far away objects.
>
>1.  Why is this?
>

One reason is that refractors have chromatic abberation. That is,
different wavelengths of light will focus differently. I believe this
was Newton's motivation for inventing the reflecting telescope.

Phil

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From: fischer@physun.physics.mcmaster.ca (Phil Fischer)
Subject: Re: obstructed view?
Message-ID: <1993Jan13.011822.26538@mcshub.dcss.mcmaster.ca>
Keywords: telescope refractor reflector
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Date: Wed, 13 Jan 1993 01:18:22 GMT
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