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Projection Distance
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Projection distance
Unit: m (inches)
Projection distance formula
D: Projected image size (Diagonal)
H: Distance between the bottom edge of the image and the center of the lens
Expression#1 (Projection Distance L) Unit: m (inches)
Expression#2 (Height H from lens center to bottom of screen)
Projected image size
Projection
Distance L
Height H from lens center to
bottom of screen
Diagonal D Width × Height
Minimum
Projection
Distance L
Maximum
Projection
Distance L
80 inch (2.03 m) 1.72 × 1.08 (68 × 42) 2.37-3.07 (94-121) 0.21 (8) 0.30 (12)
100 inch (2.54 m) 2.15 × 1.35 (85 × 53) 2.97-3.85 (117-151) 0.26 (10) 0.37 (15)
120 inch (3.05 m) 2.58 × 1.62 (102 × 64) 3.57-4.63 (141-182) 0.31 (12) 0.45 (18)
150 inch (3.81 m) 3.23 × 2.02 (127 × 79) 4.47-5.79 (176-228) 0.39 (15) 0.56 (22)
200 inch (5.08 m) 4.31 × 2.69 (170 × 106) 5.97-7.74 (235-304) 0.52 (20) 0.75 (30)
Minimum Projection Distance L Maximum Projection Distance L
L=0.029993 × D – 0.0296
(L=1.180814 × D – 1.1659)
L=0.038850 × D – 0.0290
(L=1.529526 × D – 1.1420)
Minimum Projection Distance L Maximum Projection Distance L
H=0.00260 × D – 0.00269
(H=0.10228 × D – 0.10576)
H=0.00377 × D – 0.00298
(H=0.14858 × D – 0.11738)