Melting RBTs....sure why not! Or throw em out

[P3D <JGoldenRRP@xxxxxxx>]

Larry Berlin wrote:

>>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!

Larry....can you explain why this is "extremely poor design" so we all
understand what you mean.  I have regular 2 x 2 mounts that have black sides
or color coded sides on them.....used in Ektagraphic shows.  Thanks

>>LB: If you need a system for distinguishing front from back, some simple
marking is much better than endangering your slides with basic heat
absorption from accidental misplacement in the projector. 

Excellent point....no doubt.

>>A basic solution would be to only use mounts that are white. Aluminum
mounts would be ideal for hotter projectors. 

Well first you might want to see Dr T's tests. on the differnt types of
mounts....see his temp charts on mount surface temps in projectors.

RBT mounts were designed for the RBT 101 projector , first and foremost,  I
have said this many times over on Photo 3-D, and dont mind saying it
again...the glass RBT's were designed to hold the chip flat to the focus
plane, not to protect from heat, even though they add some protection from
that...but that is of no issue in the RBT projector...which...like the
Brackett Dissolver,.......runs very cool.

The idea of the black side of the mount facing an older style hotter
projection bottle was not intended...that would be the personal choice of the
individaul, not recommended by me or RBT....I cannot understand why one would
use the black side  in the first place.  Other than they were using the black
side forward for their hand viewing situation...which as we know...hand
viewing situations outnumber projection.

>> LB...andIt would also be a good idea to add
ventilation fans to any projector that seems to get too hot. Surplus stores
sell fans pretty cheap.

Sure...and again....people ought to see Dr.T's suggestions here....and do
note that Brad Richmond who had this melting problem, was accidentally using
the black side of the mount facing the wrong way, and corrected that. 

Gary Nored said:

>>Stuff and nonsense! I use black/white RBTs, black side to the lamp.  They
come out of my TDC 716 with twin 750 watt lamps still cool to the  touch. I
don't see how, but fact is, they just don't get warm. Of course, I never
leave one in for 10 minutes either! If the audience didn't fall asleep, I
would.

Gary's  point is well made....if you are leaving a slide in your projection
unit...and an RBT is melting (160 degrees according to Dr T).....I would'nt
think for a second of continuing this until I got the projector ventilation
problem upgraded.  That aint no slide mount problem...thats the projector
that needs the fix.


To finally make the point one more time....as did Gabriel...the white side is
for reflecting heat...the black side is for masking.  In  organisational
situation...especially in the dark when projecting....it comes in handy to
see the slide orientation.

RBT has considered oyther colors as well...opaque greens, blues, reds....for
more organisational options...and presentation....how about a Valentines day
set in Red....or Xmas in Red and Green, etc.etc.

At any rate.....Larry....good points on projection and I can understand why
RBT's are not for everybody...but then again...what is?  Regar-D-D-D-s Jon
Golden RBT USA




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