P3D Re: RE: P3D Re: Close Focussing Realist

[michaelk@xxxxxxxxxxx (Michael Kersenbrock)]

> Another way to overcome the problem is to use *prismatic* close-up lenses.
> These have a wedge shape and need to be oriented properly.  They shift
> the image to eliminate the "image loss" that occurs in close-ups.
> Prismatic close up lenses exist for the View-Master and also in series
> V, etc. for stereo cameras.  I have tried one rather strong close up
> filter and noticed keystone distortion in the image.

Just as a "FYI" there also exists a stereo prismatic close-up lens
adapter for the Stereo Graphic that has a third party's name on it
(I know because I have one).  Its lens holding casting fits snug on the "barrels" 
around the camera's lenses such that can support the whole camera.   It has a
moveable jointed half not "bolted" to the camera that can attach to a tripod
holding the camera nominally in an upright position.

Interesting contraption.  It's obvious (if looking for it) that it's a
close-up with prismatic tendancies.  :-)

If my description makes anybody curious enough I can take a picture of
it and put it on my web site.  Not sure how well my description conveys
how it looks.  :-)

Mike K.




> 
> George Themelis
> 
> 


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