Epson Powerlite 7250 Users Guide

							Positioning the Projector
63
To get the best results when projecting your images, it’s important to 
position the projector at the proper height and distance relative to the 
screen.
When projecting from a table or desk, place the projector so the lens is 
aligned as closely as possible with the bottom of your screen: 
						

							2    Using the Projector
            64
When projecting from the ceiling, align the lens as closely as possible 
with the top of your screen:
Using the Keystone Feature
In circumstances where the lens cannot be properly aligned, use the 
projector’s Keystone function to help maintain optimum screen 
geometry. This feature allows you to correct up to a 
± 20° tilt, 
maintaining an aspect ratio of 4:3. Press the Keystone button on the 
control panel to increase or decrease the image adjustment. Using the 
ELP Link IV software, you can correct up to a ± 30° tilt. For more 
information, refer to Chapter 3. 
						

							Positioning the Projector
65
Calculating Image Size and Projection Distance
The distance between the projector and the screen determines the 
actual image size. To determine the exact distance required for a 
particular image size (or to determine the size of an image at a 
particular distance), use the formulas given below. (Remember that 
the size of the image can be changed by rotating the zoom ring; see 
page 68 for more information.)
To determine the minimum and maximum diagonal size of an image 
when you know the projection distance:
❐Inches:
Maximum diagonal size = (0.6124 × projection distance) + 1.5264
Minimum diagonal size = (0.4556 × projection distance) + 1.1410
❐Centimeters:
Maximum diagonal size = (0.6124 × projection distance) + 3.8771
Minimum diagonal size = (0.4556 × projection distance) + 2.8981
To determine the projection distance when you know the diagonal size 
of the screen image:
❐Inches:
Maximum projection distance = (2.1949 × diagonal size) - 2.5044
Minimum projection distance = (1.6328 × diagonal size) - 2.4923
❐Centimeters:
Maximum projection distance = (2.1949 × diagonal size) - 6.3612
Minimum projection distance = (1.6328 × diagonal size) - 6.3304 
						

							2    Using the Projector
            66
For example, here are the measurements for three installations:
* For an image size of 300 inches, the projector may be up to 54 feet away from 
the screen, depending on the setting of the zoom ring.
Long Throw Zoom Lens Calculations
If you are using the optional long throw zoom lens, use the following 
formulas instead:
To determine the minimum and maximum diagonal size of an image 
when you know the projection distance:
❐Inches:
Maximum diagonal size = (0.4742 × projection distance) + 3.2489
Minimum diagonal size = (0.2849 × projection distance) + 1.8968
❐Centimeters:
Maximum diagonal size = (1.2045 × projection distance) + 8.2522
Minimum diagonal size = (0.7236 × projection distance) + 4.8179
Image size (diagonal)Horizontal distance from projector to screen
Minimum Maximum
300 inches* (762 cm) 487.3 inches (12.4 m) 656.0 inches (16.7 m)
200 inches (508 cm) 324.1 inches (8.2 m) 436.5 inches (11.1 m)
100 inches (254 cm) 160.8 inches (4.1 m) 217.1 inches (5.5 m) 
						

							Positioning the Projector
67
To determine the projection distance when you know the diagonal size 
of the screen image:
❐Inches:
Maximum projection distance = (3.5094 × diagonal size) - 6.6568
Minimum projection distance = (2.1090 × diagonal size) - 6.8519
❐Centimeters:
M
aximum projection distance = (8.9139 × diagonal size) - 16.9083
Minimum projection distance = (5.3569 × diagonal size) - 17.4038 
Fixed Wide Angle Lens Calculations
If you are using the optional fixed wide angle lens, use the following 
formulas instead. To determine the minimum and maximum diagonal 
size of an image when you know the projection distance:
❐Inches:
Maximum diagonal size = (0.730 × projection distance) + 3.919
Minimum diagonal size = (0.616 × projection distance) + 3.050
❐Centimeters:
Maximum diagonal size = (1.8542 × projection distance) + 9.9542
Minimum diagonal size = (1.5646 × projection distance) + 7.7470
To determine the projection distance when you know the diagonal size 
of the screen image:
❐Inches:
Maximum projection distance = (1.619 × diagonal size) - 4.702
Minimum projection distance = (1.367 × diagonal size) - 5.640
❐Centimeters:
M
aximum projection distance = (4.1122 × diagonal size) - 11.9430
Minimum projection distance = (3.4721 × diagonal size) - 14.3256  
						

							2    Using the Projector
            68
Focusing and Positioning the Screen Image
When an image appears on screen, check that it is in focus and 
correctly positioned on the screen. To focus the image, rotate the focus 
ring (the inside ring on the lens). To adjust the size of the image, rotate 
the zoom ring (the outside ring). Rotate the zoom ring clockwise to 
make the screen image larger or counterclockwise to make it smaller.  
  
 
zoom ringfocus ring 
						

							Focusing and Positioning the Screen Image
69
If you need to raise or lower the image on the screen, extend or retract 
the two feet at the bottom of the projector as follows:
1. Stand behind the projector and support the front of it while you 
lift up on the foot adjust levers, located above the feet. This 
unlocks the adjustable feet so they can move up and down. Don’t 
let the projector drop.
Caution: Don’t hold or lift the projector by its lens. This can damage 
the lens.
2. While lifting the levers, raise or lower the projector until the screen 
image is correctly positioned.
3. Release the levers to lock the feet in their new position.
4. If you want to fine-tune the height of the projector, turn the 
adjustable feet clockwise to raise the height, and counterclockwise 
to lower the height.
Note: You can also use the projector’s Keystone function to help get 
optimum screen geometry. Press the Keystone button on the control panel 
to correct up to a ± 20° tilt, maintaining an aspect ratio of 4:3. Using the 
ELP Link IV software, you can correct up to a ± 30° tilt.  
						

							2    Using the Projector
            70
Resizing the Projected Image 
The Resize button lets you select the projection method for certain 
types of image signals input from a computer. Press the Resize button 
on the control panel or the remote control to select one of the 
following projection methods for your projector.
PowerLite 5350:
With images less than SVGA (800 
× 600), you can either display the 
image in the center of the projection area or display it full size.
With images greater than SVGA size (up to 1024 
× 768 pixels), you 
can project the entire image in a compressed format. If you keep 
pressing the Resize button, the projector will pan around areas of the 
image. The projector automatically reduces the image size to the 
projector’s maximum resolution.
Note: The Resize button cannot be used with images at SVGA 
(800
×600) resolution.
PowerLite 7250 and PowerLite 7350:
With images less than XGA (1024 
× 768), you can either display the 
image in the center of the projection area or display it full size.
With images greater than XGA size (up to 1600 
× 1200 pixels), you 
can project the entire image in a compressed format. If you keep 
pressing the Resize button, the projector will pan around areas of the 
image. The projector automatically reduces the image size to the 
projector’s maximum resolution.
Note: The Resize button cannot be used with images at XGA 
(1024
×768) resolution. 
						

							Sleep Mode
71
Sleep Mode
Sleep mode conserves electricity by automatically turning off the lamp 
after the projector has not been used for 30 minutes. In sleep mode, 
the projector’s power status indicator is orange and only a minimum 
amount of the projector’s circuitry remains on. This conserves 
electricity, cools the projector, and extends the life of the lamp. When 
the projector is in sleep mode, you can press the Power button to start 
projecting images, or you can unplug the projector’s power cord.
Controlling the Projector
You can use the remote control or the control panel on top of the 
projector to perform the following actions: 
❐Turn the power on or off 
❐Automatically set up the computer image 
❐Switch between input images (Computer 1, Computer 2, or 
Video)
❐Access the projector menus to adjust the image, audio, video, and 
display settings
❐Resize the projected image
❐Freeze the display (remote control only)
❐Temporarily display a blank screen
❐Adjust or mute audio/video output
❐Use custom functions (remote control only)
❐Move the mouse pointer (remote control only)
❐View online help 
						

							2    Using the Projector
            72
Using the Remote Control
Power
Freeze
A/V Mute
E-ZoomR/C ON
OFF
3
15
24
Enter
Esc
Enter (pointer) 
button
Esc button
Freeze
A/V Mute
E-Zoom
Special effects 
buttons (1-5)
Illumination
IR Output
Powe r
battery cover
cover lock
Remote 
Control On/Off