Re: RBT format information-opening sizes

[P3D Jon Golden <3dman@xxxxxxxxxxx>]

Bill Mackin wrote:

>>I'm fairly new to this list, and Realist cameras in general.  The
only mount I've used so far is a slip-in type, and it was VERY
hard to get things aligned perfectly, I thought.  Vince spoke
highly of these 'RBT mounts':
> (4-p, 5-p and 7-p widths; and the RBTs are
> (I think) available in wide and full-frame width)
What does the 4-p, 5-p, 7-p mean? What is the difference between wide
and full-frame? How do I know which I should be using? Where can I order
these mounts? Thanks. Bill Mackin

Bill...here are the specs on the mounts.  Remember that any wider format
can use the narrower openings as making options.  For instance...and
camera that shoot the 5 perf...or five sprocket hole wide format...can
also use the RBT 4 as a masking option.  Shooting full-frame cameras 
means you can use the  RBT F and four other sizes below it as masking
options.  *Note: an RBT F full-frame is 23mm x 33mm, so not truly
full-frame or 24mm x 36mm, to allow for some masking power for stereo
alignment.

RBT 4 can be used with a variety of HALF-FRAME or four sprocket hole
formats such as the Nimslo...or beam splitter attachments. Plus any
cameras that shoot wider formats

RBT 4  Nimslo format   21 x 16mm 
RBT 4G Nimslo format   21 x 16mm with Anti-Newton glass

RBT 5 is known as the REALIST NORMAL FORMAT or five sprocket hole wide,
all the following cameras can use the RBT 4 as well for, and can be used
with the Realist, Revere, Kodak, Illoca, Wollensak, TDC, Delta...plus
any cameras that shoot wider format

RBT 5  Realist format   23 x 21mm
RBT 5G Realist format   23 x 21mm with Anti-Newton glass

RBT 7 is know as the EUROPEAN or seven sprocket hole format.  Typically
Belplascas, Busch Veriscope, FED, and other european stereo 35mm
models.  Plus any cameras that shoot a wider format 

RBT 7  Euro format   23 x 28mm
RBT 7G Euro format   23 x 28mm with Anti-Newton glass

RBT W is known as the WIDE FORMAT...used for cameras that shoot full
frame...where you need a bit more masking power. All RBT cameras,
Hektrons, Miller Bros...Sam Smith specials...and any modern SLR format
cameras can use this...or sizes smaller

RBT W Wide format   23 x 31.5mm
RBT WG Wide format   23 x 31.5mm with Anti-Newton glass

RBT F is known as the sterewo FULL FORMAT mount....although not truly
full-frame (See above) ALL that applies to the RBT W applies
here...except certain RBT X series "A" models which shoot the RBT W or
smaller width options

RBT F  Full SLR format   23 x 33mm
RBT FG Full SLR format   23 x33mm with Anti-Newton glass
         

One-sided glass mounts helps if you project, especially in  7 & W & Full
formats.  Two anti-Newton glass pieces nest flush into left and right
apertures of a white halve, providing one-sided protection from bulb
heat, eliminating popping of the emulsion for more accurate focusing on
screen.


Any further questions...or a free sample:

Email your slo mail address and specify one size sample you would like
to try....or

SASE to 3D Concepts
Box 205
Waban, MA 02168

regar-D-D-D-s Jon Golden RBT USA


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