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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) 1.63 × 1.22 (64 × 48) 2.25–2.91 (89–114) 0.09 (4) 0.18 (7)
100 inch (2.54 m) 2.03 × 1.52 (80 × 60) 2.82–3.65 (111–143) 0.12 (5) 0.23 (9)
120 inch (3.05 m) 2.44 × 1.83 (96 × 72) 3.39–4.38 (134–172) 0.14 (6) 0.27 (11)
150 inch (3.81 m) 3.05 × 2.29 (120 × 90) 4.24–5.49 (167–216) 0.18 (7) 0.34 (14)
200 inch (5.08 m) 4.06 × 3.05 (160 × 120) 5.67–7.33 (223–288) 0.24 (9) 0.46 (18)
Minimum Projection Distance L Maximum Projection Distance L
L=0.028462 × D – 0.0296
(L=1.120538 × D – 1.1659)
L=0.036817 × D – 0.0290
(L=1.449479 × D – 1.1420)
Minimum Projection Distance L Maximum Projection Distance L
H=0.00119 × D – 0.00148
(H=0.04680 × D – 0.05819)
H=0.00230 × D – 0.00214
(H=0.09073 × D – 0.08430)