GLASS MOUNTING & SPOTTING SLIDES FOR A/V USING
ANTI-NEWTON GLASS MOUNTS
By John Ruffell. LRPS APAGB FRSA.
Make sure the glasses are clean, if not clean them with a suitable cloth. Take the dark plastic side and lay it inside uppermost on a hard surface with the logo `Gepe` (which is now on the underside) at the bottom towards you. The reason for attention to the logo is that any batch of slides should be all mounted the same way to prevent any possible `shift` on the screen later. It has been found that mounts in the same batch, mounted in different ways up can affect screen registration.
Next place the slide film emulsion side under the foil clips top and bottom of the inside of the dark Gepe mount. The foil is best raised slightly beforehand to accommodate the film. The picture should be viewed as taken - either hold the mount up to the light or over a lightbox to make sure it is properly centralized, replacing it on a hard surface.
Now place the white side of the Gepe Mount on top of the dark side, making sure the plastic grooves locate properly, and firmly press down, making that it `seals` all the way round. Should an otherwise sharp slide appear fuzzy on the screen, maybe the two halves have not been completely pressed home. Another point which can cause some slides to appear unsharp is when some of the film has been mounted on the white side of the Gepe Mounts while others are mounted on the dark side. A Gepe Press is available to help mount the slides. The white side of the mount should always face the projector lamp when in the gate of the projector.
Spotting the slides: With the picture as seen when it was taken facing you, the spot goes in the bottom left corner of the mount. For A/V purposes, having spotted the slide, now turn it so that the appears top right. This is as it will be in most projectors to project correctly on the screen. In this latter position write a three letter identification code for the title of the sequence. (Eg.: Flowers of Spring - FOS) followed by the number in the sequence.Additional notes:-
Although stick on coloured "Spots" are prescribed, I have experienced these falling off plastic mounts and being a nuisance. I use coloured marker permanent ink pens to indicate the "Spots" and then further blue or black pens to mark identification numbers, which seems to work very well.
When initially marking numbers on an incomplete sequence I have numbered lightly with a pencil, or soluble ink pen.
On a few occasions I have had a sharp slide appear unsharp on the screen which seems properly mounted. By using a completely fresh mount and remounting the slide, the problem has been solved.