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P3D Laser target for camera rangefinder

  • From: roberts@xxxxxxxxxxxxxxxxx (John W Roberts)
  • Subject: P3D Laser target for camera rangefinder
  • Date: Fri, 6 Nov 1998 08:39:44 -0500

>Date: Thu, 5 Nov 1998 19:59:19 -0700
>From: MarkKernes@xxxxxxx
>Subject: P3D laser sighting

>In a message dated 11/5/98 6:00:45 PM, Dr. T wrote:

><<The "split-image" rangefinder in the Realist will not work with a point
>light source.  It needs a vertical line.  Is the Revere different?>>

>Hmmm... we'll find out!

A cylindrical lens will turn a laser "dot" into a line segment.

It might be a challenge to find a cylindrical lens with a long enough
focal length to avoid stretching the line out so far that it becomes
too faint to use (though dark ambient conditions should help).

John R


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