Panasonic PT-MZ780

Chapter 2 Getting Started — Setting up
40 - ENGLISH
Formula for calculating the projection distance per projection lens
To use a projected image size not listed in this manual, check the projected image size SD (m) and use the
respective formula to calculate projection distance.
All the units for the formula are m. (Value obtained by the following calculation formula contains a slight error.)
When calculating a projection distance using image size designation (value in inches), multiply the value in inches
by 0.0254 and substitute it into SD in the formula for calculating the projection distance.
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Zoom Lens
Projection lens Model No. Throw ratio Aspect ratio
Projection distance (L) formula
Min. (LW) Max. (LT)
Standard zoom lens/ET-ELS20
1.61 - 2.76:1 16:10 = 1.389961 x SD - 0.054882 = 2.363976 x SD - 0.048228
1.61 - 2.76:1 16:9 = 1.428602 x SD - 0.054882 = 2.429695 x SD - 0.048228
1.93 - 3.32:1 4:3 = 1.573583 x SD - 0.054882 = 2.676260 x SD - 0.048228
ET-ELW22
0.786 - 0.983:1 16:10 = 0.690394 x SD - 0.048460 = 0.855787 x SD - 0.045477
0.787 - 0.984:1 16:9 = 0.709587 x SD - 0.048460 = 0.879578 x SD - 0.045477
0.947 - 1.18:1 4:3 = 0.781595 x SD - 0.048460 = 0.968837 x SD - 0.045477
ET-ELW20
1.21 - 1.66:1 16:10 = 1.055748 x SD - 0.055497 = 1.437441 x SD - 0.053400
1.21 - 1.66:1 16:9 = 1.085098 x SD - 0.055497 = 1.477402 x SD - 0.053400
1.46 - 2.00:1 4:3 = 1.195197 x SD - 0.055497 = 1.627323 x SD - 0.053400
ET-ELT22
2.72 - 4.48:1 16:10 = 2.366220 x SD - 0.114022 = 3.858307 x SD - 0.112874
2.73 - 4.49:1 16:9 = 2.432001 x SD - 0.114022 = 3.965568 x SD - 0.112874
3.28 - 5.39:1 4:3 = 2.678780 x SD - 0.114022 = 4.367992 x SD - 0.112874
ET-ELT23
4.44 - 7.12:1 16:10 = 3.866693 x SD - 0.212284 = 6.141575 x SD - 0.210772
4.44 - 7.12:1 16:9 = 3.974187 x SD - 0.212284 = 6.312311 x SD - 0.210772
5.34 - 8.56:1 4:3 = 4.377480 x SD - 0.212284 = 6.952874 x SD - 0.210772
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Fixed-focus Lens (Model No.: ET-ELW21)
Projection lens Model No. Throw ratio Aspect ratio Projection distance (L) formula
ET-ELW21
0.764:1 16:10 = 0.676299 x SD - 0.057678
0.765:1 16:9 = 0.695100 x SD - 0.057678
0.922:1 4:3 = 0.765630 x SD - 0.057678