BenQ MX720, MW721 manual Obtaining a preferred projected image size

Obtaining a preferred projected image size

The distance from the projector lens to the screen, the zoom setting, and the video format each factors in the projected image size.

Projection dimensions

Refer to "Dimensions" on page 57 for the center of lens dimensions of this projector before calculating the appropriate position.

MX720
Maximum zoom	Minimum zoom
	Screen
	Center of lens
	Vertical offset
	Projection distance

The screen aspect ratio is 4:3 and the projected picture is 4:3

Screen size		Size of the		Distance from screen (mm)
		projected image					Vertical
Diagonal		W	H	Min length		Max length	offset
				(max.	Average		(mm)
Inch	mm	(mm)	(mm)			(min. zoom)
				zoom)
40	1016	813	610	1333	1467	1600	30
50	1270	1016	762	1667	1833	2000	38
60	1524	1219	914	2000	2200	2400	46
70	1778	1422	1067	2333	2567	2800	53
80	2032	1626	1219	2667	2933	3200	61
90	2286	1829	1372	3000	3300	3600	69
100	2540	2032	1524	3333	3667	4000	76
120	3048	2438	1829	4000	4400	4800	91
150	3810	3048	2286	5000	5500	6000	114
200	5080	4064	3048	6667	7333	8000	152
250	6350	5080	3810	8333	9167	10000	191
300	7620	6096	4572	10000	11000	12000	229

For example, if you are using an 120-inch screen, the recommended projection distance is 4400 mm and the vertical offset is 91 mm.

If your measured projection distance is 6.0 m (6000 mm), the closest match in the "Distance from screen (mm)" column is 5500 mm. Looking across this row shows that a 150'' (about 3.8 m) screen is required.

14 Positioning your projector