Slide Masking

[bob.aldridge@xxxxxx (Bob Aldridge)]

Jeremy Hinton wrote:

->I too have tried masking a stereo slide pair individually, but 
->without great success. 

stuff deleted

->If the image is mounted in a foil mount (I use Albions), then a
->second foil (the 'masking foil') can be placed over the first. Slide
->it horizontally to make the 'window' narrower, and vertically to
->'letterbox' it. Trim overlapping edge of 'masking foil' as required.
->Bind mount as usual. Job done.

This was my preferred method until I started using the automatic RBT
projector. Unfortunately, bound up mounts just don't drop reliably.

->This method ensures equal masking of the left and right image,
->avoiding the potential problem of the depth of one side of the window
->being different from the other. It is also very straightforward - but
->perhaps only for foil mounts.  With a little more work it may be
->possible to use the ready-made-window quality of foil mounts to serve
->as masks in RBT mounts? 

I too thought that I could use foil mounts as mask in RBT mounts. Sadly,
the foil is too thick, and the pins don't hold the mount fully closed.
They work open in a fairly short time, and then jam in with the RBT
projector.

So now I mount conventionally in the RBT mounts, (actually, I always
tape the chips in as well as using the pin locators) and then mask with
the silver tape that the Widescreen Centre (and also, I believe, Reel
3D) sell for just this purpose. The glue is designed to work without
bleeding, and the metalised tape is truly opaque. Care is needed to
ensure that exactly the same amount is masked from both chips.

Oh, and while I'm writing about mounting subjects, have any of the
proponents of using two white halves of RBT mounts for projection ever
actually tried it? If you do, you'll find that the only purpose that
this would serve would be the mechanical holding of the chips. The
masking effect would be very low as the white halves of RBT mounts are
translucent at best and virtually transparent at worst! You'll see all
the sprocket holes and other gubbins on the screen...

Best wishes

Bob Aldridge
Stereoscopic Society Projectionist
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 * POW 2.0  0007 * "I keep pressing the ESCape key, but I'm still here!"


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