NEC MT830 - Manual (Page 17)

E-16
Distance Chart
A
C
D
E
Formulas (mm)
H inch=Horizontal Screen Width
M =1.25H / 33.02 (Projection magnification)
A =C / cos
α
C (WIDE) = 53.2
ןM – 85.609
C (TELE) = C (WIDE)
ן1.3055
D = {(3H/8) – (92.2 + 8M)}
= 1.906M – 92.2
E = 92.2 + 8M
A : Distance between the lens and the screen center
C : Horizontal throw distance between the screen surface and the lens
D : Vertical distance between the projector bottom and the bottom of image
E : Vertical distance between the projector bottom and the screen center
α