P3D Flloyd & Floating with RBT mounts

[Jon Golden / 3D Concepts <3dman@xxxxxxxxxxx>]

Michael Georgeoff wrote
>I moved from RBT to paper mounts and devised a rig wherein I mount the left
>chip, and (being right handed) can control the right film chip with minimal
>resistance (as compared to "driving a plastic hunk...").  I am really
>floating a chip with full horizontal, vertical and rotation movement, and I
>can get some pretty good precision mounting, but I am assessed the penalty
>of it taking me time to get there.

Michael and all.

What a great day to float chips......here comes Hurricane Flloyd!  New
England is expecting 6-8 inches of rain....whoooey....lets float!

Periodically I  post a message on this subject because I hear it said that
the "rigid" calibrated system the RBT mount uses, does not allow them to
"FLOAT" the image.  I am not sure if you are implying that you can't float
your images in RBT mounts.  If that is what you mean, then consider YOU CAN
float images, no different than any other stereomount.  Read on.

1) It is very easy and flexible  to use an RBT mount when floating
images...like cha-chas (side shift stereo with and SLR)  or hypers because
if I need to, I can lock in chip one....with the white pin bars the RBT
system uses, and FLOAT chip two, without worrying about chip one getting
away from me.

2) Then, just tab down (Reel 3D  tab Cat #8020 two-pack will last for a
llllong time) chip two.

3) Also...in many cases, once the floated chip is in place....I can use the
other chip, locked on the white pin bar for precise horizontal registration
of the window


If chip one needs to float as well, due to too much rotation and vertical
offset from camera operator errors, the just remove the white pin bar and
float both chips
In other words....just as one would do with any other mount.

May I add more on this subject, with an old P3D posting by Ray Moxom
(thanks Ray!) ...which is another clever way to float chips with RBT
mounts.  See below.

Regar-D-D-D-s
Jon Golden

SNIP
With reference to the discussion on rotating the chips in RBT mounts
(Mark Kernes & Larry Berlin, etc, etc), The following may be of interest.

I found that I needed to slightly rotate one chip in a series of aerial
hypers.

This is the procedure that I used:

1. Fix the first chip in the normal way
2. For the other chip, cut an RBT pin bar into three so that there is
one
chip pin on each "mini pin bar"
3. Use two  "mini pin bars" for the chip that needs to be rotated - turn
the
"mini pin bar" and/or have one on the top rail and one on the bottom
rail to
get the required rotation. (Normal pin bars allow adjustments of up to
0.4mm
in 0.1mm increments.)
4. I found it easier to use the alternative pin bars that allow
adjustments
in approximately 0.2mm increments to a total of 0.7mm.

The procedure worked perfectly. Once I had done a couple I found that
the
procedure was quick and worked well. I found it best to make any height
adjustment with the chip that was not rotated.

This procedure only works for small rotations. If large rotations are
required, as can sometimes occur with aerial hypers, I then use the 20mm
high Spicer cardboard mounts.

Ray Moxom