Overhead projectors are used to project transparencies. One contains a glass plate with a light source from below that reflects the image in the transparency through a lens on an arm to a screen. Transparencies are polyester films of a standard A4 paper size that allows light to pass through.
Overhead projectors are simple to use and they were the first ones to be used for business and classroom presentations. This was before the arrival of data and video projectors. The projector can be set up in 10 seconds, the arm can be bent for easy portability and weighs approximately 14 lbs. The resolution can be in the range of 4000 lumens. The OHP comes with accessories such as a portable stand so that projector can be placed in the middle of the classroom, a collapsible screen, extension cords with different lengths, and sockets.
The rental rates usually vary from $30 to $50 daily, $100 for a week and $200 for a month. Most of the university classrooms have OHPs installed. The advances in data projection for CD, DVD and laptops have reduced the demand for OHP.
Use of overhead projectors has declined with the flashy presentations of PowerPoint. Still they are occasionally used in universities, in classrooms for lectures, and job training. They are preferred over data projectors as they are simple and don’t require computers for input. The transparencies can be modified during the lecture itself, which makes it versatile. The disadvantage is that OHP is fragile and bulky. Also, care should be taken to ensure that the transparencies are clear. For instance, photocopied text book pages will look bad on the screen.
Some of the important branded overhead projectors are 3M, Bell & Howell, Dukane, and High Lumens. Specific features such as built-in lamps and image magnifiers add to the higher rental rates.
Related Articles of Interest :
-
Video Projector Rentals
10 August 2010 8:30 PM |
No Comments
A video projector is a device that projects a video or computer image onto a screen. The commonly used inputs are video cassette players, CD and DVD players and PowerPoint presentations from computers. Some computers have CD as well as DVD drives which support these...
-
An Introduction To LCD Projector Rentals
10 August 2010 8:30 PM |
No Comments
LCD is a technology that is used to present a digital image for viewing, for instance, on a laptop or via a projector. LCD is the acronym for Liquid Crystal Display. Most projectors use LCD technology. They can easily incorporate text, graphics and video. These...
-
Computer Projector Rentals
10 August 2010 8:30 PM |
No Comments
Computer projectors have become indispensable for company presentations. The audio-visual impact alone really drives a difficult point home. Most computer renting companies also provide computer projectors. However renting a computer projector can be complex as projectors are custom-designed for different operating systems and even processors....
-
Film Projector Rentals
10 August 2010 8:30 PM |
No Comments
A film projector projects reels of film onto a screen to form a continuous image. Film projectors have the need to wind and unwind the reels and adjust the arms and distance. Despite the competition from video projection, film projectors have a niche market of...
-
Computer Projector Rentals: A Guide
10 August 2010 8:30 PM |
No Comments
Any meeting or conference requires a computer to handle inputs like data, graphics, video and audio. Computer as a multimedia application has properties comparable to standalone players for VCD or DVD. With the integration of IT and the Internet into the audio visual industry, computers...
-
Projector Screen Rentals
10 August 2010 8:30 PM |
No Comments
Projector screens are used to project data and video. Screens can be made of material such as the conventional cloth materials like bedsheets, tarp and synthetic material. For informal occasions such as outdoor residential movies, the former are used. For formal occasions and also for...
-
Projector Rentals
10 August 2010 8:30 PM |
No Comments
The rentals industry is huge. It was worth $4 billion in 2002 in the US. This industry is comprised of rental of automotive such as passenger cars; commercial and industrial equipment for industries such as mining and construction; and consumer electronic goods such as video...
-
Video Projector Screens
10 August 2010 8:30 PM |
No Comments
A projector is an apparatus for presenting an enlarged image on a screen from a transparency such as a photographic slide or a film. In a motion picture projector, each frame is held stationary at an illuminated aperture for a brief period, and then advanced...
-
LCD Projector Rentals
10 August 2010 8:30 PM |
No Comments
There are a few basic rules you need to follow when renting an LCD Projector. Plan ahead, at least one to two weeks in advance, to make sure the right type of projector is available for rent. The type and power of the LCD Projector...
-
An Introduction To Projectors
10 August 2010 8:30 PM |
No Comments
A projector is an apparatus for presenting an enlarged image on a screen from a transparency such as a photographic slide or a film. In a motion picture projector, each frame is held stationary at an illuminated aperture for a brief period, and then advanced...