NEC VT491 specifications Diagrams and Distance Charts, Ceiling Mounted Desktop

	NEC Display Solutions of America, Inc.
VT491/590/595 Installation Guide
Ceiling Mounted and Desktop	Rev 1.3

Diagrams and Distance Charts

The following shows the proper relative positions of the projector and screen. Refer to the table to determine the position of installation.

Distances are in inches. For millimeters multiply by 25.4.

Ceiling Mounted

Desktop

		C	5.26"
D	Screen Top	Throw Distance	5.68"
Lens Ctr
B
Screen Ctr
			Lens Offset From
			Mount Pipe
			3.27"
		C

Throw Distance

Screen Ctr

B

Lens Ctr

D

Screen Bottom

2.57"

Distance Chart for popular 4:3 screens
	Screen Size (4:3)			B		C	D	α
	Diag	W	H		wide - tele			wide - tele
	inches	inches	inches	inches	inches		inches	degrees
	30	24	18	6	35	- 43	-3	10.2 - 8.5
	60	48	36	13	72	- 87	-5	10.1 - 8.4
	72	57.6	43.2	15	87 - 104		-6	10.0 - 8.4
	84	67.2	50.4	18	101	- 122	-7	10.0 - 8.4
	90	72	54	19	109	- 130	-8	10.0 - 8.4
	100	80	60	21	121	- 145	-9	10.0 - 8.3
	120	96	72	26	145	- 174	-10	10.0 - 8.3
	150	120	90	32	182	- 218	-13	10.0 - 8.3
Note: For screen sizes not indicated on the projection	180	144	108	38	218	- 262	-16	10.0 - 8.3
tables, use the formulas on page 1.	200	160	120	43	243	- 291	-17	10.0 - 8.3
	250	200	150	53	304	- 364	-22	9.9 - 8.3
	300	240	180	64	365	- 438	-26	9.9 - 8.3
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