BenQ MX661 user manual Obtaining a preferred projected image size, Projection dimensions

Obtaining a preferred projected image size

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

Projection dimensions

Refer to "Dimensions" on page 95 for the center of lens dimensions of this projector before calculating the appropriate position.

Maximum zoom	Minimum zoom
H	H	Diagonal
Diagonal
W	W	Vertical offset

Screen

Center of lens

Projection distance

The screen aspect ratio is 4:3 and the projected picture is 4:3
	Screen size			Projection distance (mm)
Diagonal				Min		Max	Vertical offset
		W	H	distance		distance
		(mm)	(mm)		Average		(mm)
Inch	mm			(max.		(min.
				zoom)		zoom)
30	762	610	457	1200	1260	1320	69
40	1016	813	610	1600	1680	1760	91
50	1270	1016	762	2000	2100	2200	114
60	1524	1219	914	2400	2520	2640	137
80	2032	1626	1219	3200	3360	3520	183
100	2540	2032	1524	4000	4200	4400	229
120	3048	2438	1829	4800	5040	5280	274
150	3810	3048	2286	6000	6300	6600	343
200	5080	4064	3048	8000	8400	8800	457
220	5588	4470	3353	8800	9240	9680	503
250	6350	5080	3810	10000	10500	11000	572
300	7620	6096	4572	12000	12600	13200	686

For example, if you are using a 120-inch screen, the average projection distance is 5040 mm and with a vertical offset of 274 mm.

If your measured projection distance is 5.0 m (5000 mm), the closest match in the "Projection distance (mm)" column is 5040 mm. Looking across this row shows that a 120'' (about 3.0 m) screen is required.

All measurements are approximate and may vary from the actual sizes.

BenQ recommends that if you intend to permanently install the projector, you should physically test the projection size and distance using the actual projector in situ before you permanently install it, so as to make allowance for this projector's optical characteristics. This will help you determine the exact mounting position so that it best suits your installation location.

16 Positioning your projector