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Installation
If the projector is used with a screen size not listed in this manual, check the diagonal dimension (inch) of your
screen and calculate the projection distance using the following formulas.
Calculation formulas for projection distance by lens types (for PT-D7700U)
Minimal distance: L=0.1123 x Screen diagonal (inch) – 0.1158
Maximal distance: L=0.1786 x Screen diagonal (inch) – 0.1013
16:9
ET-D75LE5
(0.8:1)
Model number of projection lens
Aspect ratio
Projection distance (L) formula Units: m
L= 0.0158 x Screen diagonal (inch) – 0.0835
L= 0.0172 x Screen diagonal (inch) – 0.0835
ET-D75LE1
(1.5–2.0 :1)
Minimal distance: L=0.0307 x Screen diagonal (inch) – 0.0760
Maximal distance: L=0.0410 x Screen diagonal (inch) – 0.1004
4:3
16:9
Minimal distance: L=0.0334 x Screen diagonal (inch) – 0.0760
Maximal distance: L=0.0446 x Screen diagonal (inch) – 0.1004
ET-D75LE2
(2.0–3.0 :1)
4:3
Minimal distance: L=0.0412 x Screen diagonal (inch) – 0.0795
Maximal distance: L=0.0617 x Screen diagonal (inch) – 0.1064
16:9
Minimal distance: L=0.0617 x Screen diagonal (inch) – 0.0958
Maximal distance: L=0.1031 x Screen diagonal (inch) – 0.1216
Minimal distance: L=0.0448 x Screen diagonal (inch) – 0.0795
Maximal distance: L=0.0672 x Screen diagonal (inch) – 0.1064
4:3
ET-D75LE3
(3.0–5.0 :1)
16:9
Minimal distance: L=0.0672 x Screen diagonal (inch) – 0.0958
Maximal distance: L=0.1123 x Screen diagonal (inch) – 0.1216
Minimal distance: L=0.1031 x Screen diagonal (inch) – 0.1158
Maximal distance: L=0.1639 x Screen diagonal (inch) – 0.1013
4:3
ET-D75LE4
(5.0–8.0 :1)
16:9
Minimal distance: L=0.1786 x Screen diagonal (inch) – 0.3862
Maximal distance: L=0.3346 x Screen diagonal (inch) – 0.3598
Minimal distance: L=0.1640 x Screen diagonal (inch) – 0.3862
Maximal distance: L=0.3072 x Screen diagonal (inch) – 0.3598
4:3
ET-D75LE8
(8.0–15.0 :1)
16:9
4:3
Zoom
lens
Fixed-
focus
lens