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THE SLIDE PROJECTOR Computer, The Better Way of Projecting Slides Disadvantages to Slide Projector Presentation Operation Conclusion EFFECTIVE USING The slide projector will be the next of the media forms to be expelled from the classroom, going the way of film projectors, the opaque projector, and so forth. The reasons include: The computer can store and arrange slides (pictures) easier and more efficiently than using single slides. The quality of digital cameras and computer projectors has improved to the point that computer slides can be projected at the basically same quality as a normal slide. Pictures go directly from the camera into the computer where they are ready for storage and manipulation (archived; placed in a PowerPoint or other presentation, cropped, "fixed-up"). DISADVANTAGES The use of slides/slide projectors have always has major disadvantages. They could not be viewed in normal room light. Most rooms would have to be darkened completely, including covering up all light from windows. Slides have to be mounted in trays before viewed efficiently in sequence. Mounting out-of-order, upside-down or backwards is a common occurrence. The slides can easily fall out of the tray before putting them on the projector, causing disturbance in the classroom presentation and a lot of frustration.. Positioning the slide projector in the classroom is not always easy. For many projectors the slides will not fall into the projector properly if the projector is tilted at a steep angle (which also causes keystoning {Keystoning occurs when the projection direction is not straight, causing the picture to be oblong rather than rectangular.}). In such cases the projector cannot be simply placed on a desk in the classroom but must be raised (via a stand, or in many cases, putting a chair on a desk, thus blocking the view a students sitting behind it). The slide's frame occasionally opens slightly, causing the slide film to move and be projected off-centered (with the white bulb light showing on the edges). Open slide frames can also cause jamming of the slide projector. Jamming is an endemic problem of slide projectors. Bad or slightly open frames, a slightly cracked or warped tray, a small foreign object in the machine's mechanism or numerous other quarks in the operation can cause jamming. OPERATION Mounting slides in tray. For a normal front-projection, slides should be mounted into the tray upside-down and reversed. Putting a marker dot in the top right-hand corner of the slide in its mounting position will make it simpler to place the slide for each loading.. This will work for the majority of situations using straight and round (carousel) trays; however, there are projectors that load slides from a different angle, so be careful to check the projector out beforehand and load the slides accordingly. Use Find the power switch and turn on the machine. Load the slide tray onto its track, pushing it to the loader mechanism of the projector. Push the forward button until the first slide comes up. Most all slide projectors have forward and reverse buttons on a remote control. Some projectors have only one button: pressing it normally will forward the slide; pressing hard will go in reverse. In addition, many have these buttons on the body of the machine. {Many machines will not show any light until a slide is loaded into the machine.} Focusing Turn on the projector and project a slide. Depending on the projector, focus the slide by turning the lens, itself, or a knob in the front of the projector that adjusts the lens, until the picture focuses. Not all slides focus exactly the same. Either they will be adjusted automatically by the machine or there will be a manual focus button on the remote control for you to use when needed. {NOTE: A slide can also be transformed to an overhead transparency (usually by scanning onto computer and printing out a transparency). This method might be all right for projecting diagrams, but the quality is not usually good enough for projecting most slide pictures. CONCLUSION In the long run, it will probably be advantageous to scan your slide archive onto computer. Though it is certainly easier to set up and run a slide projector over a computer (with its projector), the advantages of using a computer format will eventually save time and make classroom presentation more reliable and efficient. Ó 2005 Steven F. Rosenberg