Search results
Results from the WOW.Com Content Network
CAUTION: In some projector/lens specifications, the ability of a lens to adjust (zoom) its throw ratio is given as yet another ratio. This can be a source of confusion. For the above example, a manufacturer might say that the lens has a zoom ratio of 2.5 (3.0 / 1.2 = 2.5), or a "2.5:1 zoom lens". A greater zoom ratio means that the lens is able ...
Example: for a 1080 HDTV used at a distance of 250 cm, you need to find a screen whose height is close to 250 / 3.2 = 78 cm (63 inches diagonally). Find the right video resolution. Example: a 53 cm high screen (43 inches diagonal), located at a distance of 300 cm, does not need to show video with a resolution higher than HD 720 .
A projector's throw ratio is used when installing projectors to control the size of the projected display. [1] For example, if the throw ratio is 2:1 and the projector is fourteen feet away from the screen, then the display width will be seven feet.
Overhead projectors normally include a manual focusing mechanism which raises and lowers the position of the focusing lens (including the folding mirror) in order to adjust the object distance (optical distance between the slide and the lens) to focus at the chosen image distance (distance to the projection screen) given the fixed focal length ...
The viewing cone refers to the effective viewing directions of an LCD display, as seen from the eye. This collection of angles resembles a cone. The concept has been introduced as an international standard ISO 13406-2, which defines it as the range of viewing directions that can safely be used for the intended task without "reduced visual performance".
On 2D displays, such as computer monitors and TVs, display size or viewable image size (VIS) refers to the physical size of the area where pictures and videos are displayed. The size of a screen is usually described by the length of its diagonal , which is the distance between opposite corners, typically measured in inches.
Buying a portable-size projector can make things much easier, and Amazon is having a one-day sale on the soda-can-sized Anker Nebula Capule projector — it's $70 off!
The Snell & Wilcox Test Chart #2 (or SW2) is used for general adjustments of video processors, mixing equipment, and display devices such as CRT TVs and projectors. Main features and tests allowed by the chart are: [12] [14] [3] Boundary markers (arrows for overscan check) Interlace check (black box with oblique white line)