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Re: front surface mirrors, distance

  • From: P3D John W Roberts <roberts@xxxxxxxxxxxxxxxxx>
  • Subject: Re: front surface mirrors, distance
  • Date: Tue, 30 Sep 1997 19:47:42 -0400

>Date: Tue, 30 Sep 1997 16:17:10 -0500
>From: "P3D Gregory J. Wageman" <gjw@xxxxxxxxxx>
>Subject: Re:  front surface mirrors, distance

>I have experience with the cheap mirror attachments, and they have a LOT
>of drawbacks.  First is attachment...
>Second problem is aperture...
>Third problem is convergence.  While looking through the viewfinder
>and seeing the double image, you will have to adjust the mirrors to
>center your subject in both images...
>Fourth problem is compositional...
>Fifth problem is resolution...

Don't forget keystone distortion. This affects the single-aperture mirror
systems (but not parallel-path mirror systems such as the Loreo).

John R


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