Using an RBT Mount as an Aligment Tool for Mounting Into Cardboard Mounts.

This web page illustrates an idea first mentioned by
Harold Baize on the photo-3d Internet email list.


  • See also the page describing how to modify the RBT mount for this purpose.


  • The film chips are placed into the modified RBT mount as they are normally used. You may like to have on-hand several modified RBT mounts that can cater for different vertical registration settings.

    The film chips are adjusted for correct window as usual with the RBT mount. The emulsion-side of the film chip is facing downwards.


    The cardboard mount is placed face-up (the side as seen in the hand-viewer) over the RBT mount with the film chips in position.


    Pick up the two mounts holding them together as shown, and turn the pair of them over...........


    ............so that the emulsion side of the chips, and the internal surface of the carboard mount is now facing you. Push both the cardboard mount and RBT mount up against an edge that is fastened to the surface of a light box (eg: possibly use double-sided tape). Check that the edges of the two mounts align visually at the sides, and double check that the two mounts are up against the reference edge.


    Tape the edges of the film chips into position using Scotch #850 non-bleeding adhesive tape.



    Remove the RBT mount by dis-engaging the registration pins with the film sprockets without disturbing the position of the film chips. (If necessary make sure the sprocket holes are covered with tape to reduce spurious light-transmission through the mount.) It is preferable for projection to only tape one edge of the film chip, as this allows for expansion of the film chip from projection heat, thus minimising film-popping and de-focussing.



    Place the un-sealed mount into the hand viewer and check the mounting. At this stage the mount can be taped shut across the top by partially removing the mount from the slot in the viewer to make the open-edge of the mount easily accessible. While the mount is held in the viewer-slot, tape the mount shut across the open edge.


    The finished mount is now ready for labelling and viewing in the stereoscope or with a stereo projector.

  • See also the page describing how to modify the RBT mount for this purpose.

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