Epson 8100i - Manual (Page 106)

100 Technical Specifications
Image Size and Projection Distance
Use the formulas given below either to find out how large your image
will be when you know the distance from the projector to the screen,
or to find out how far from the screen to place the projector if you
want an image of a certain size. Since the size of the image can be
changed by rotating the zoom ring, formulas are given for calculating
both the minimum and maximum sizes.
Standard Lens
To determine the diagonal size of an image when you know the
projection distance:
■ Inches:
Maximum diagonal size = (0.6676
×
projection distance) + 1.8
Minimum diagonal size = (0.5173
×
projection distance) + 1.4
■ Centimeters :
Maximum diagonal size = (0.6676
×
projection distance) + 4.6
Minimum diagonal size = (0.5173
×
projection distance) + 3.6
To determine the projection distance when you know the diagonal
size of the screen image:
■ Inches:
Maximum projection distance = (1.498
×
diagonal size) – 2.7
Minimum projection distance = (1.933
×
diagonal size) – 2.7
■ Centimeters:
Maximum projection distance = (1.498
×
diagonal size) – 6.9
Minimum projection distance = (1.933
×
diagonal size) – 6.9
Long Throw Zoom Lens (ELPLL02)
To determine the diagonal size of an image when you know the
projection distance:
■ Inches:
Maximum diagonal size = (0.487
×
projection distance) + 2.3
Minimum diagonal size = (0.286
×
projection distance) + 1.5
■ Centimeters:
Maximum diagonal size = (0.487
×
projection distance) + 5.9
Minimum diagonal size = (0.286
×
projection distance) + 3.7
note
The formulas given here are
for when the projector is
placed flat, without tilting it
up at the screen (see page 14).
If you tilt it up by extending
the feet or use electronic
keystone correction, your
image size may vary.