P3D Re: A new RBT mount size

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

Jon Golden wrote:

>1) I am gathering information for my trip to ISU, with the possibility of
>designing another aperture opening for RBT mounts.  If consensus says
>so...and the right info gets to me....RBT will consider designing another
>RBT mount between the Realist RBT5 23 x 21mm size, and the Ultra close-up
>RBT4  21 x 16mm size.

Currently RBT makes the following mounts:

23 x 33   - Full 
23 x 31.5 - Wide
23 x 28   - Euro
23 x 21   - Realist
21 x 16   - Nimslo

I think was it needed is a mount between Realist and Nimlso that
will allow full height images with portrait configuration, something
like the old close-up and ultra close-up EMDE and Realist mounts.
This could be something like:

23 x 18 - Close-up
23 x 16 - Full-height, half-frame (like Nimlso but full height)

>2) I am also lobbying for the design and implimentation of a masking system
>for all sizes of RBT mounts that will provide horizontal, vertical
>adjustments, and possibly a variety of unique shapes in circles,
>rectangles, triangles etc.  This would be a precision , ultra thin
>material,  that sits between two RBT halves, that is easy to use and
>adjustable.  Many of you have seen how I use half of an old EMDE foil to
>custom mask problem and special alighment requirement images ...well that
>is the concept here.

This sounds really GREAT!!!  If such accurate masking system is 
possible then you might not need all these sizes... Just the Realist 
size and some horizontal masking will give the close-up sizes.  
Vertical masking is really useful (Spicer mounts have a good
advantage with their "reduced height" mounts in that respect).
I personally don't like the EMDE masking method because the
stereo windows of the EMDE and RBT mounts do not match.  I am
looking forward to an RBT designed masking system!!!

George Themelis


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