Securing the Object
Securing The Object
The object must be secured to prevent it from moving or rocking during the exposure. One of the easiest ways to accomplish this is by putting a small ball of clay on the table where you're placing the object. Push the object into the clay. Instead of clay, you could also use "Fun-Tak". Fun-Tak is a blue-colored adhesive material with the consistency of clay. It can be pulled apart and pushed together again, rolled into balls, whatever. The material is reusable and because of it's strong adhesive properties is worthwhile to purchase.
Another way to secure objects is to glue the object to a magnet and position them with a steel plate behind the film plate.
We will shoot a hologram that is viewable in white light. In addition to the materials already mentioned you will need a white cardboard card the same size as a film plate, and a black card with two binding clips to block and unblock (shutter) the laser beam. (see figure 9) Set up the holography table as illustrated in fig 10. Position the white card, using the film holder clips, where the film plate will be located. Adjust the mirror so that the beam reflected from the mirror is spread evenly on the white card.
The spread laser beam should illuminate the card from an approximate 45 degree angle. This is important. Whatever angle the beam illuminates the card is the same angle that will be needed for white light to recreate the hologram.
Remove the white card, leaving the magnet binding clip(s) in position. The laser is now illuminating the object you are shooting. Position the object as close as possible to where the film plate will be. Look at the object from the laser side, this is what your finished hologram will look like. Make any adjustments you want to the object so that it is in the best position possible. Block the laser beam with the black shutter card.
Under safelight conditions, remove a film plate from its light tight box. Close the light tight box. The film plate appears transparent, but there is an emulsion on one side. It does not really matter which side faces which, but if you can tell, it might be better to have the emulsion face the object.
Position the film on the table and secure itsposition using the binding clips and magnets. Leave the set-up alone for a minute. This will allow any vibrations to die down.