Texas Instruments MATRIX 3000 Appendix D, Calculating Throw Distance, Where, Lens Throw Ratio

Appendix D

Throw Distance

Calculating Throw Distance

It is important throw distance be precisely calculated for your installation using the appropriate formula from the chart below. To calculate throw distance you must know the screen size and the lens type installed in the projector. In general, the larger you want the image to be the greater the distance you must allow between the lens and the screen.

NOTES: 1) Throw distance is the perpendicular distance from the screen to the center of the projector’s front feet. 2) This measurement is not necessarily parallel to the floor as the projector and screen may be inclined. 3) Due to lens manufacturing, throw distance calculations have a tolerance of ± 5%.

Table D-1 SXGA+ Throw Formulas

	Lens Throw Ratio	Throw Distance Formula (cm, +/-5%)		Screen Widths **(cm)
				Min.	Max.
	0.8 (fixed)	TD = .83*W + 1.46	51		289
	1.2 (fixed)	TD = 1.15*W + 24.51	79		1208
	1.3-1.7 (zoom)	Min. TD = 1.31*W + 3.18	69		1114
		Max. TD = 1.72*W + 3.12
	1.7-2.5 (zoom)	Min. TD = 1.70*W – 6.27	110		862
		Max. TD = 2.39*W – 6.71
	2.5-4.0 (zoom)	Min. TD = 2.45*W + 9.50	73		1150
		Max. TD = 4.01*W – 4.37
	4.0-7.0 (zoom)	Min. TD = 3.84*W + 27.84	95		973
		Max. TD = 6.67*W + 31.06
	Table D-2 720P Throw Formulas
	Lens Throw Ratio	Throw Distance Formula (cm, +/-5%)		Screen Widths **(cm)
				Min.	Max.
	0.88 (fixed)	TD = .88*W + 1.46	51		289
	1.31 (fixed)	TD = 1.31*W + 24.51	79		1208
	1.42 – 1.86 (zoom)	Min. TD = 1.42*W + 3.18	69		1114
		Max. TD = 1.86+W + 3.12
	1.86 – 2.73 (zoom)	Min. TD = 1.86*W – 6.27	110		862
		Max. TD = 2.73*W – 6.71
	2.73 – 4.38 (zoom)	Min. TD = 2.73*W + 9.50	73		1150
		Max. TD = 4.38*W – 4.37
	4.38 – 7.66 (zoom)	Min. TD = 4.84*W + 27.84	95		973
		Max. TD = 7.66*W + 31.06
Where:
TD = projector distance from the screen to the center of the projector’s front feet (cm)
W = screen (image) width (cm)
**preliminary data

Christie DS+60/DW30/Matrix 3000 User’s Manual D-1