Re: (IAAC) FWD: What should I buy? (rich field scopes)

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• Subject: Re: (IAAC) FWD: What should I buy? (rich field scopes)
• From: "Sue and Alan French" <sue_and_alan_french@msn.com>
• Date: Tue, 16 Jun 1998 21:48:53 -0400
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    Also assuming they are all air-to-glass surfaces.  Most multi-element
eyepieces are not.
-----Original Message-----
From: deepsky <deepsky@ibm.net>
To: IAAC Discussion List <netastrocatalog-announce@latrade.com>
Date: Tuesday, June 16, 1998 1:31 AM
Subject: Re: (IAAC) FWD: What should I buy? (rich field scopes)

> As far as image brightness goes, an 8 element eyepiece, assuming each
coated lens element has a
>transmision of 98.5%, will have a total transmission of 88.6%.  A 4 element
eyepiece has a
>transmision of 94

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