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Re: [ATM] Dark finish for a telescope tube

To: hermit <hermit@outofoptions.org>
Subject: Re: [ATM] Dark finish for a telescope tube
From: Dominic-Luc Webb <dlwebb@canit.se>
Date: Fri, 29 Sep 2006 15:13:34 +0200 (MET DST)
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On Tue, 26 Sep 2006, hermit wrote:

> A densitometer is a highly precision instrument for measuring
> reflectivity.  Phil Davis in his book does give a method for converting
> a spot meter for use.  The densitometer uses a fairly bright light.

Labs sometimes use common scanners for densitometry.

Dominic-Luc Webb

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