Panasonic LB20NTU - Manual (Page 63)

Other
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Projection dimensions calculation methods
If the screen size (diagonal) is SD (m), then the following formula is used to
calculate the projection distance for the wide lens position (LW) and the
projection distance for the telephoto lens position (LT).
*The values obtained from the formulas above are approximate.
For 16:9 aspect ratios, the following formula can be used to calculate the
projection distance.
E
NGLISH
-63
SD
SW
4:3
LW/LT
H1
SH
LW=0.030xSD/0.0254-0.037
LT=0.036xSD/0.0254-0.037
LW=0.031xSD/0.0254-0.038
LT=0.037xSD/0.0254-0.038
LW=0.035xSD/0.0254-0.037
LT=0.042xSD/0.0254-0.036
PT-LB20NTU/PT-LB20U
PT-LB20SU
PT-LB20VU
LW=0.032xSD/0.0254-0.037
LT=0.039xSD/0.0254-0.037
LW=0.033xSD/0.0254-0.038
LT=0.040xSD/0.0254-0.038
LW=0.038xSD/0.0254-0.037
LT=0.046xSD/0.0254-0.037
PT-LB20NTU/PT-LB20U
PT-LB20SU
PT-LB20VU