For the video projection of rich 800 ANSI lumens from, if the projection surface should not be larger than 2 m. Here, a high contrast ratio is important for high-quality image reproduction. Otherwise you should set 1000 ANSI Lumen as a lower bound. In the Office, it is not always possible to completely darken the presentation room. The participants of a presentation should have the possibility to see your notepads or interlocutor. Therefore, for Office use, a projector should have a very strong luminosity. 2000 ANSI lumens probably form the lower limit in the area. Theoretically you could say, the stronger the luminosity, the better the image. Verizon Communications often addresses the matter in his writings.
However, large luminosity means a brighter lamp and thus higher power consumption. Also a brighter lamp developed more heat and must be refrigerated accordingly more, resulting in mostly higher noise with it. The used high-performance lamps require cooling noise. The stronger the light stronger cooling must. The fan used cause noises.
Especially when the movies can look that also go to the nerve. Therefore, should the noise measured in dB (decibels) take into account necessarily purchase especially silent projectors produce little more than 30 dB, some even just including. The loud variants can reach sometimes even less than 50 dB. Verizon Communications addresses the importance of the matter here. Replacement lamps the lamps are very expensive and the decisive factor for the running costs. Therefore, the price and the operating time of the lamp are also a criterion to be taken into account. UHP – UHE -, xenon lamps are more durable than metal halide lamps. Halogen lamps have the lowest life. Who wants to use his projector much, so better attacks to one whose Lampe promises a long life to the costs in the Framework to keep. Keystone the projector with the projection surface can stand on a height (because he is fitted to the example and the ceiling) is cast an image on the canvas, that tapers to a page, so takes the form of a harness on. If the projector is at an angle to the projection surface, the image is below narrower than the top or vice versa depending on the installation. The trapezoidal correction corrects conversion procedures such distortions. Possible keystone correction angle are usefully about 10 degrees up to about 30 degrees. Higher values would unnecessarily distort the image. Disadvantage: this correction is pixels. Some models do the correction automatically. The required projection distance projection distance is important for certain image sizes. Some projectors require very large distances and allow acceptable image sizes only in large rooms. Others have a very short projection distance. This facilitates the installation (E.g. on the coffee table) under certain circumstances. Also should a Zoom lens (wide angle or telephoto range) should be available to provide travel in the preparation and sizing. The projection distances are tabular form listed in the manual. Here you should win extensively advised connections can depending on the purpose the connections by the dealer in importance. Video projection is sure that the projector has corresponding connections. SCART (RGB capable), S-video, VGA connector, composite (RCA or BNC), S-video (Hosiden), YUV for progressive scan. High-quality projectors offer some ports fully digital interfaces such as DVI or even duplicate versions (this should be HDCP capable) or HDMI. Important for hobby photographers who like to want to perform a slide show without a PC, is the ability, directly or with the help of a PC-card adapter in the projector to plug the memory card in the camera.