Toshiba TDP-ET20 User Manual - Page 24

Projection Distance and Size Use the figures, tables, and formulas below to determine the projection size and projection distance. (Projection sizes are approximate values for full-size picture with no keystone adjustment.) Screen As seen from above Lens center Preparations As seen from side Lens center a (cm) = projection size (inches) x 1.433 - 13.32 H (cm) = projection size (inches) x 0.1868 "a" is the distance (cm) between front edge of the projector and the screen, and corresponds to a range of 40 cm to 177 cm. "H" is the height from the image bottom to the center of the lens. projection size inches (=cm) 40 (=101.6 cm) 50 (=127.0 cm) 60 (=152.4 cm) 80 (=203.2 cm) 100 (=254.0 cm) 120 (=304.8 cm) projection distance a (cm) [inches] Edge of the projector to image 44.0 [17.3] 58.3 [23.0] 72.7 [28.6] 101.3 [39.9] 130.0 [51.2] 158.6 [62.5] height (H) (cm) [inches] 7.5 [2.9] 9.3 [3.7] 11.2 [4.4] 14.9 [5.9] 18.7 [7.4] 22.4 [8.8] 23