NEC VT800 manual 138

8. Appendix

Screen Size and Projection Distance

Throw Distance and Screen Size

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

		Screen center
			B
	2.85"/72.3 mm		D
		Lens center	Screen bottom
Projector bottom	C

Distance Chart

B = Vertical distance between lens center and screen center C = Throw distance

D = Vertical distance between lens center and screen bottom (top of screen for ceiling application)

α= Throw angle

NOTE: Distances may vary +/-5%.

Screen Size			B		C		D		a
Diagonal	Width	Height		Wide – Tele				Wide – Tele
inch	inch	inch	inch		inch		inch	degree
21	17	13	4	–	–	29	-2	–	–	8.6
25	20	15	5	28	–	34	-2	10.3	–	8.6
30	24	18	6	34	–	41	-3	10.2	–	8.5
40	32	24	8	46	–	56	-4	10.1	–	8.4
60	48	36	12	70	–	84	-6	10.1	–	8.4
72	58	43	15	84	–	101	-7	10.0	–	8.4
80	64	48	17	93	–	112	-8	10.0	–	8.4
84	67	50	17	98	–	118	-8	10.0	–	8.4
90	72	54	19	105	–	126	-8	10.0	–	8.4
100	80	60	21	117	–	141	-9	10.0	–	8.3
120	96	72	25	141	–	169	-11	10.0	–	8.3
150	120	90	31	176	–	211	-14	10.0	–	8.3
180	144	108	37	211	–	254	-17	10.0	–	8.3
200	160	120	41	235	–	282	-19	10.0	–	8.3
210	168	126	43	247	–	296	-20	10.0	–	8.3
240	192	144	50	282	–	339	-23	9.9	–	8.3
270	216	162	56	318	–	381	-25	9.9	–	8.3
300	240	180	62	353	–	424	-28	9.9	–	8.3

Screen Size			B		C		D		a
Diagonal	Width	Height		Wide – Tele				Wide – Tele
mm	mm	mm	mm		mm		mm	degree
533	427	320	110	–	–	730	-50	–	–	8.6
635	508	381	130	720	–	870	-60	10.3	–	8.6
762	610	457	160	870	–	1050	-70	10.2	–	8.5
1016	813	610	210	1170	–	1410	-100	10.1	–	8.4
1524	1219	914	310	1770	–	2130	-140	10.1	–	8.4
1829	1463	1097	380	2130	–	2560	-170	10.0	–	8.4
2032	1626	1219	420	2370	–	2850	-190	10.0	–	8.4
2134	1707	1280	440	2490	–	2990	-200	10.0	–	8.4
2286	1829	1372	470	2670	–	3210	-210	10.0	–	8.4
2540	2032	1524	520	2970	–	3570	-240	10.0	–	8.3
3048	2438	1829	630	3570	–	4290	-290	10.0	–	8.3
3810	3048	2286	790	4470	–	5370	-360	10.0	–	8.3
4572	3658	2743	940	5370	–	6450	-430	10.0	–	8.3
5080	4064	3048	1050	5970	–	7170	-480	10.0	–	8.3
5334	4267	3200	1100	6270	–	7530	-500	10.0	–	8.3
6096	4877	3658	1260	7170	–	8610	-570	9.9	–	8.3
6858	5486	4115	1410	8070	–	9690	-640	9.9	–	8.3
7620	6096	4572	1570	8970	–	10770	-710	9.9	–	8.3

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