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Building a Behind the Lens Beam Splitter


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#1 Brian Alan

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Posted 16 February 2012 - 03:00 PM

I'm trying to gather some information on how to build a behind the lens beam splitter. I have been looking at Dichroic prism's which separate three colors using angles and coatings on the prism. I was also looking at the "behind the lens prism" the old Bolex used to use and the design of the AMP HDR camera and would like to build my own splitter so I can use one lens and two cameras for some experimental uses.

Can anyone point me in the direction to gather some more info?
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#2 dan kessler

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Posted 16 February 2012 - 09:40 PM

There are prism-type (like the Bolex), plate-type
and pellicles. All can be made with varying degrees
of reflection and transmission. The plate-type
might introduce ghost images, depending on the
thickness of the glass substrate. Pellicles are
extremely thin membranes (to avoid ghosting),but
they are very delicate.

Some sources for new or surplus:

Rolyn Optics
Edmund Scientific
Anchor Optics
Surplus Shed

Google will get you to all of them and also
link you to all the info you can handle.
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#3 Mohan Sandhu

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Posted 21 February 2012 - 09:26 AM

Ive had a couple of mirrors from still cameras re silvered by scientific mirrors in London, the price was tiny and the turn around fast, I believe they do semi silvered mirrors and optical coatings.
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#4 Chris Millar

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Posted 21 February 2012 - 02:52 PM

How much of it are you wanting to build ?

You want to start with a bucket if sand and a bowl of assorted rare earth elements ?

Or do you mean you want to simply build a mount between one you bought and your cameras? Somewhere in between ?
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