Laser projectors have a much longer lamp life compared to traditional bulb projectors. The brightness and color reproduction also stays the same, whereas the brightness of bulb projectors can slowly degrade over time.
Contrast ratio is the visual distance between the lightest and the darkest colors that may be reproduced on the display. A high contrast ratio is desired, resulting in richer dark colors and more distinctive color gradation.
A projector zoom allows you to increase or decrease the size of the projected image without moving the projector. The most common zoom ratio among today's projectors is 1.2, which means you can vary the image size by 20% by simply adjusting the zoom lens.
AirPlay allows wireless connection of Apple devices with external screens or speakers. You may stream computer screen, video and music from iOS devices, play games like on consoles or present your slideshows easily on your TV.
Bluetooth is a wireless technology standard that allows data transfers between devices placed in close proximity, using short-wavelength, ultra-high frequency radio waves. Newer versions provide faster data transfers.
If the projector is not perpendicular to the projection surface, it will distort the image. Vertical lens shift allows you to correct this distortion so that you can place the projector below or above the projected image (e.g. mounting the projector to the ceiling).
If the projector is not perpendicular to the projection surface, it will distort the image. Horizontal lens shift allows you to correct this distortion so that you can place the projector to the left or right of the projected image.