NEC MT830 user manual Distance Chart, Formulas mm

Distance Chart

C
A
α	E
	D

Formulas (mm)

H inch=Horizontal Screen Width

M =1.25H / 33.02 (Projection magnification)

A =C / cosα

C (WIDE) = 53.2×M – 85.609

C (TELE) = C (WIDE) ×1.3055

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

E-16