Epson 7800p 사용자 설명서

EPSON PowerLite 7800p Projector

5/03

EPSON PowerLite 7800p Projector 

- 

3

Follow these guideline when deciding where to place the 
projector:

❏ Place the projector on a sturdy, level surface.
❏ Make sure there is plenty of space for ventilation around 

and under the projector. Do not set it on top of anything 
that could block the vents under the projector. 

❏ Make sure the projector is within 10 feet of a grounded 

electrical outlet or extension cord. 

Image size increases with distance, but varies depending on 
how you’ve adjusted the optical zoom and other settings. 

It’s best to place the projector directly in front of the center of 
the screen, facing the screen squarely. If it isn’t placed this 
way, the image will be “keystone” shaped, instead of 
rectangular. 

If you place the projector below screen level, you’ll have to tilt 
it up by extending the front adjustable foot. This also causes 
the image to lose its rectangular shape. To correct distortion, 
see “Adjusting the Image Shape” on page 8.

Use the formulas 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. 

To determine the diagonal size of an image (in inches) when 
you know the projection distance:

❏ Maximum diagonal size =

(((2.54 

×

 projection distance) / 100) 

×

 36) 

+

 2.13

❏ Minimum diagonal size = 

(((2.54 

×

 projection distance) / 100) 

×

 26.84) 

+

 1.29

To determine the projection distance (in inches) when you 
know the diagonal size of the screen image:

❏ Maximum projection distance = 

(((diagonal size – 1.29) / 26.84) 

×

 100 / 2.54

❏ Minimum projection distance = 

(((diagonal size – 2.13) / 36) 

×

 100 / 2.54

To determine the diagonal size of an image (in inches) when 
you know the projection distance:

❏ Maximum diagonal size = 

(((2.54 

×

 projection distance ) / 100) 

×

 27.42) 

+

 1.49

Minimum diagonal size = 
(((2.54 

×

 projection distance) / 100) 

×

 20.48) 

+

 1.1

To determine the projection distance (in inches) when you 
know the diagonal size of the screen image:

❏ Maximum projection distance = 

(((diagonal size – 1.1) / 20.48) 

×

 100 / 2.54

❏ Minimum projection distance = 

(((diagonal size – 1.49) / 27.42) 

×

 100 / 2.54

To determine the diagonal size of an image (in inches) when 
you know the projection distance:

❏ Maximum diagonal size = 

(((2.54 

×

 projection distance) / 100) 

×

 20.4) 

+

 1.93

❏ Minimum diagonal size = 

(((2.54 

×

 projection distance) / 100) 

×

 15.23) 

+

 1.45

To determine the projection distance (in inches) when you 
know the diagonal size of the screen image:

❏ Maximum projection distance = 

(((diagonal size – 1.45) / 15.23) 

×

 100 / 2.54

❏ Minimum projection distance = 

(((diagonal size – 1.93) / 20.54) 

×

 100 / 2.54

2.5 to 3.5 ft

5.3 to 7.2ft

27 to 36.5 ft

approx. distance

from 60” screen

 TBD

Overhead View

Projector

Screen