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Overhead Projectors, Why Some People Still Prefer Them
With the advent of technology nowadays, more and more sophisticated presentation tools has sprung up to replace some of the more conventional equipment we see in business offices or school classrooms. Do you remember that traditional overhead projectors, where you write your presentations in colored markers on transparencies for your official presentations?
Though most of them have been replaced by some of the digital visual presentation projectors, they still have a place in some settings. After all, they're some of the most simple machines to operate. Especially when you're try to illustrate something to your class or audience off the cuff, jotting down your ideas on a transparency is definitely easier. Transparencies are polyester films of a conventional A4 paper size which allows light to infiltrate.
Overhead projectors are easy to use and admittedly, they were one of the pioneer presentation equipment used for business and classroom presentations, before digital visual presentation equipment such as data and video projectors came about. Though it's undeniable that use of the overhead projectors has declined with the colorful and at times interactive presentations of PowerPoint, they're still occasionally used in classrooms for lectures, colleges and career training.
They are generally still preferred over data projectors since they're pretty simple and don't need a computer before you can use it effectively. Besides, the transparencies can often be easily modified during the lecture itself, making it a much more versatile application. People who dislike the overhead projector will tell you that it's bulky and fragile. A times, the projection can also look ghastly. Especially when care is not exercise duly to ensure that the transparencies are clear, such as in the case of photocopied text book pages on the transparencies.
Using the overhead projector is pretty easy. In fact, it can be setup in about 10 seconds. The projecot arm can also be easily adjusted for easy portability and weighs about 14 Ibs. The overhead projector's resolution can be in the range of four thousand lumens and the equipment often comes with accessories like, a portable stand so that it can be positioned in the centre of the classroom, extension cords with different lengths together with a socket and a collapsible screen.
Overhead projectors are used to reflect details and information on transparencies. One contains a glass panel with a illumination source from below which reflects the image in the transparency through the lens on the arm to project to a screen.
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