Vidikron operation manual Vision 120 Lens Options and Throw Ratios

Installation

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 desired 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 3-1.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.

Estimating Throw Distance

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

Screen	width
		(w)

TD

Figure 3-1. Estimating Throw Distance

Table 3-3lists the available lens options for the Vision 120 and their associated throw ratios.

Table 3-3. Vision 120 Lens Options and Throw Ratios

		Throw Range in inches,		Throw Ratio	Throw Range in inches,
Lens Option	Throw Ratio	with 96x54-inch (1.78:1)		with Primary	with 126.9x54-inch
	with Primary	Screen		Lens and	(2.35:1) Screen
(Note 2)
	Lens Only			Anamorphic
		Minimum	Maximum		Minimum	Maximum
				Lens
A1	0.70 Fixed	67.20
A2	1.155 Fixed	110.88		Not Applicable (Note 2)
B	1.42 - 1.79	136.32	171.84
C	1.86 - 2.51	178.56	240.96	1.42 - 1.88	180.20	238.57
D	2.67 - 4.19	256.32	402.24	2.03 - 3.13	257.61	397.20
E	4.32 - 6.98	414.72	670.08	3.15 - 5.48	399.74	695.41

Notes:

1. Throw distance does not affect image quality, provided these ranges are taken into account.

2. Only the C, D and E lenses can be used with the optional CineWide (secondary anamorphic) lens. Doing so affects the throw distances as shown here.

18 Vidikron Vision Model 120 Installation/Operation Manual