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 perspective on an arm to a screen. Transparencies are polyester movies of a standard A4 paper size that permits light to go through. Overhead projectors are simple to use and they were the initial ones to be used for business and homeroom presentations. This was before the appearance of information and video projectors. The projector can be set up in 10 seconds, the arm can be bent for easy versatility and weighs approximately 14 lbs. The resolution can be in the range of 4000 lumens. The OHP comes with accessories, for example, a portable stand so projector can be placed in the middle of the study hall, a collapsible screen, extension ropes with different lengths, and sockets.
The rental rates for the most part fluctuate from $30 to $50 every day, $100 for a week and $200 for a month. The majority of the university study halls have OHPs installed. The advances in information projection for CD, DVD and PCs have reduced the demand for OHP. Use of overhead projectors has declined with the ostentatious presentations of PowerPoint. Still they are sometimes used in universities, in study halls for lectures, and employment preparing. They are preferred over information 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 massive. Additionally, care ought to be taken to ensure that the transparencies are clear. For instance, photocopied text book pages will look awful on the screen.
Some of the significant branded overhead projectors are 3M, Bell and Howell, Dukane, and High Lumens. Specific features, for example, worked in lights and image magnifiers add to the higher rental rates. In the event that you take your time and browse through the many web stores you will be able to definitely discover an השכרת מקרן ומסך organization who will flexibly you with quality equipment for your business presentations, remembering for site technical help, whenever required. Depending on how you wish to hire the equipment, these companies will offer you a variety of terms and conditions with least rentals to accommodate your budget.