Panasonic PT-D7700U Operating Instructions Manual page 22

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
Model number of projection lens Aspect ratio
ET-D75LE1
(1.5–2.0 :1)
ET-D75LE2
(2.0–3.0 :1)
Zoom ET-D75LE3
lens (3.0–5.0 :1)
ET-D75LE4
(5.0–8.0 :1)
ET-D75LE8
(8.0–15.0 :1)
Fixed-
ET-D75LE5
focus
(0.8:1)
lens
22
Minimal distance: L=0.0307 x Screen diagonal (inch) – 0.0760
4:3
Maximal distance: L=0.0410 x Screen diagonal (inch) – 0.1004
Minimal distance: L=0.0334 x Screen diagonal (inch) – 0.0760
16:9
Maximal distance: L=0.0446 x Screen diagonal (inch) – 0.1004
Minimal distance: L=0.0412 x Screen diagonal (inch) – 0.0795
4:3
Maximal distance: L=0.0617 x Screen diagonal (inch) – 0.1064
Minimal distance: L=0.0448 x Screen diagonal (inch) – 0.0795
16:9
Maximal distance: L=0.0672 x Screen diagonal (inch) – 0.1064
Minimal distance: L=0.0617 x Screen diagonal (inch) – 0.0958
4:3
Maximal distance: L=0.1031 x Screen diagonal (inch) – 0.1216
Minimal distance: L=0.0672 x Screen diagonal (inch) – 0.0958
16:9
Maximal distance: L=0.1123 x Screen diagonal (inch) – 0.1216
Minimal distance: L=0.1031 x Screen diagonal (inch) – 0.1158
4:3
Maximal distance: L=0.1639 x Screen diagonal (inch) – 0.1013
Minimal distance: L=0.1123 x Screen diagonal (inch) – 0.1158
16:9
Maximal distance: L=0.1786 x Screen diagonal (inch) – 0.1013
Minimal distance: L=0.1640 x Screen diagonal (inch) – 0.3862
4:3
Maximal distance: L=0.3072 x Screen diagonal (inch) – 0.3598
Minimal distance: L=0.1786 x Screen diagonal (inch) – 0.3862
16:9
Maximal distance: L=0.3346 x Screen diagonal (inch) – 0.3598
4:3 L= 0.0158 x Screen diagonal (inch) – 0.0835
16:9 L= 0.0172 x Screen diagonal (inch) – 0.0835
(for PT-D7700U)
Projection distance (L) formula Units: m