P3D Re: Re: P3D Re: filter device for Revere and Realist

[Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

At 6:49 AM -0800 11/25/97, ERIC KIRSCHNER wrote:
>As a contribution to the discussion about filters for Revere and Realist, I
>will describe my own solution to the problem.  It is easy to make, very
>cheap - not the most elegant device you have seen, but it works!
>
>For a filter holder, I take two black halves of RBT 23x28 plastic frames,
>drill/grind/file a ~25 mm hole between the two apertures. It goes perfectly
>on a Realist.  To be used on a a Revere, one has to grind/file a little
>more in the apertures, in order to fit the objectives. Two ~5x100 mm rubber
>bands hold the device in place.
>
>As colour filters I use Wratten gelatine filter; for polarizing filters I
>use three mountings: 0, 45 and 90 degrees.  Turning the 45 around, you have
>a fourth filter of 135 degrees.

Very clever!  I didn't quite follow, are you trimming the gels down to fit
in the mount?

-Jim C.

----------------------
Jim Crowell
Caltech Division of Biology
216-76
Pasadena, CA 91125
Tel: (818) 395-8337
Fax: (818) 795-2397
jim@xxxxxxxxxxxxxxx



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