Knoll Systems LED1081 user manual Estimated Throw Distance

Throw Distance

Throw distance is the distance measured from the front of the projector to the screen. This is an important calculation in any projector installation as it determines whether or not you have enough room to install your projector with a de- sired screen size and if your image will be the right size for your screen.

You can quickly estimate the throw distance by taking the width of the screen and multiplying it by the lens throw ratio; see Figure 3-2. The result of this calculation tells you roughly how far back the projector should be positioned from the screen in order to project a focused image large enough to fill the screen.

Estimated Throw Distance

Throw Distance (TD) = Screen Width (w) x Lens Throw Ratio

TD

Screen	width
		(W)

Figure 3-2: Estimated Throw Distance

A replacement lens for the LED1081 is available, one with 1.56-1.86:1 lens (HDL10ST). With optional zoom adaptors throw ratios of 1.24 – 3.0 can be achieved.

The standard LED1081 offers throw ratios between 1.85:1 and 2.40:1.

The HDL10ST optional short-throw lens offers throw ratios between 1.56:1 and 1.86:1.

Installation 19