Re: RBT mounts in projection

[P3D Dr. George A. Themelis <DrT-3d@xxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Larry Berlin writes:

>If your slide mounts have a black side and a white side, that's EXTREMELY
>POOR DESIGN for ANY slide holder regardless of which projector you may use.
>Throw them out! 

Ouch!!! Larry with these two sentences you just "killed" the very popular
(especially in projection) RBT mounts!

I frankly do not see why the B&W design of these mounts can be a problem
in a properly designed and operating projector.  As Jon said earlier, if
you are reaching temperatures that will melt the RBT mount then you might
as well kiss your slides goodbye and get out the marshmallows!!!  My 
measurements showed a cool 100F temperature around an RBT mounted slide, 
similar to a glass mounted slide.

Actually, I was thinking that the RBT mount makes a very good temperature
sensor.  I am taking one tomorrow to work to see at which temperature it
starts melting and if there is a difference between the black and white
piece.  My impression is that the RBT mount will start melting first
before the film chip are damaged so you could use it to check the projector 
to see if it is safe for your images.  A new application for RBT mounts:  
Checking temperature limits for projection!

George Themelis, toasting marshmallows in Cleveland with a TDC with heat 
filters removed!!!


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