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Setting-up dimensions which are not given in the table can be calculated
using the formulas below.
SD (m): Screen size (diagonal)
LW: Projection distance for the wide lens position
LT: Projection distance for the telephoto lens position
Model No. of projection lens Aspect ratio
Methods of calculation of Projection distance (L) Unit: mm
Zoom lens
ET-LE10
(1.3-1.7:1)
4:3
LW = 0.027xSD/0.0254-0.0523
LT = 0.0355xSD/0.0254-0.0509
16:9
LW = 0.0294xSD/0.254-0.0523
LT = 0.0387xSD/0.0254-0.0509
ET-LE20
(2.6-4.2:1)
4:3
LW = 0.0554xSD/0.0254-0.134
LT = 0.0871xSD/0.0254-0.136
16:9
LW = 0.0604xSD/0.254-0.134
LT = 0.0949xSD/0.254-0.136
ET-LE30
(4.0-5.6:1)
4:3
LW = 0.0809xSD/0.0254+0.104
LT = 0.1147xSD/0.0254+0.096
16:9
LW = 0.0881xSD/0.0254+0.104
LT = 0.1250xSD
/0.0254+0.096