Quick guide to slide projectors
Slide projectors have traditionally been used to display photographs
which had been transferred to see-through acetate 35mm slides which are
then projected onto a projector screen. There are not now many
manufacturers of slide projectors as photography has gone digital which
means that the demand for slide projectors has been replaced by a demand
for digital projectors
The easiest way to explain the differences between slide projectors is
to show a comparison chart of Reflecta models and explain the
Let's start with watts. The more watts, the brighter the image.
The 150 watt models display a bright image that in a room with dimmed
lights would project well onto a large 6ft by 6ft screen. A screen
of this size would be fine in a school classroom, for example, where
there is an audience of around 30 people. Moving up to the 250
watt models, this is almost doubles the brightness. This means that
the screen size can double which is better for larger rooms and
To move to the next or previous slide, then you need to press a button
on the remote control. There are either a remote control on the
end of a wire or a wireless infrared remote control. Infrared is
same technology used on television remote controls, where you have point
it directly at the television sensor to change channels. Infrared
slide projectors are slightly more expensive.
When you position a projector in front of a projection screen, then then
lens will need focusing so that the slide is displayed clearly. On
most projectors you do this by turning a focusing wheel until the image comes into
focus. If you then move the projector, you will have to do this
again. Auto focus projectors do this bit for you.
Magazine systems are the type and shape of the trays that hold the
slides. For example, the slide projector at the top of this page
uses straight tray system magazines such as Universal, CS and LKM.
Carousel slide projectors have a circular slide tray as in the picture
So it is a case of using trays that match your slide projector.
In order to fill a projector screen, you move the slide projector back
and place it until the image has filled the screen (within a range).
Zoom lenses allow you to change the size of the projected image by
turning a wheel. This means that you have a bit more control
on where you place the projector in front of the screen as sometime you
cannot put the projector the right distance away from the screen.
A couple of other things you may need to know if buying your first
projector. Slide projectors are quiet except for their cooling
fans to keep the lamps from overheating the projector. Slides can
get jammed but most new slide projectors have anti-jamming systems
You can use a slide viewer instead of a projector. These are
small, battery powered devices that allow you to slot in a slide
and view. They look almost like a small television.
Slide scanners can be used to capture the image from a slight to your
computer. See our article:
convert slides to digital