Optoma TX551 User's Manual - Page 23
Adjusting Projection Image Size
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Adjusting Projection Image Size Refer to the graphic and table below to determine the screen size and projection distance. Maximum zoom Minimum zoom Screen Center of lens Screen size Diagonal [inch (cm)] 30 (76) 60 (152) 80 (203) 100 (254) 150 (381) 200 (508) 250 (635) 300 (762) Vertical offset Projection distance 4 : 3 Screen Projection distance [inch (m)] Image height (min. zoom) (max. zoom) [inch (cm)] 45.3 (1.2) 92.2 (2.3) 123.5 (3.1) 154.8 (3.9) 233.0 (5.9) 311.2 (7.9) 389.4 (9.9) 467.6 (11.9) 50.6 (1.3) 102.9 (2.6) 137.7 (3.5) 172.5 (4.4) 259.6 (6.6) 346.7 (8.8) 433.8 (11.0) - 18 (45.72) 36 (91.44) 48 (121.92) 60 (152.4) 90 (228.6) 120 (304.8) 150 (381.0) 180 (457.2) Vertical offset [inch (cm)] 2.70 (6.86) 5.40 (13.72) 7.20 (18.29) 9.00 (22.86) 13.50 (34.29) 18.00 (45.72) 22.50 (57.15) 27.00 (68.58) Note Position the projector in a horizontal position; other positions can cause heat build-up and damage to the projector. Keep a space of 30 cm or more between the sides of the projector. Do not use the projector in a smoky environment. Smoke residue may build-up on critical parts and damage the projector or its performance. Consult with your dealer for special installation such as suspending from a ceiling. EN-23