HP sb21 HP Digital Projectors xb31 and sb21 - (European English) Owner Manual - Page 19

operation Adjusting the hp sb21 focus Rotate the focus ring until the image is clear. The projector will focus at distances from 1.0 m to 12 m (3.3 feet to 39.4 feet). Focus Ring sb21 Projected image size (diagonal) Focal Distance Calculating the Projected Image Size The screen diagonal dimension can be approximated by using one of these formulas: 7.5*Distance(ft.)=Diagonal(in.) 0.625*Distance(m)=Diagonal(m) For example: If your sb21 is 10 feet from the screen, the approximate screen diagonal dimension will be 7.5*10 = 75 inches. Screen (Diagonal) Screen Size (wxh) Focal Distance 25" 98" 123" 197" 246" 295" 20.0"x15.0" 78.4"x58.6" 98.4"x73.8" 157.6"x118.2" 196.8"x147.6" 236.2"x177.2" 3.3' 13.1' 16.4' 26.2' 32.8' 39.4' NOTE: This graph is for user's reference only. 19