NEC LT280 User Manual page 40

5. Repeat steps 2 and 4 to correct keystone distortion.
6. After completing Keystone correction, press the ENTER button.
The Keystone screen will disappear.
• To perform Keystone correction again, press the 3D REFORM button to
display the Keystone screen and repeat above steps 1 to 6.
NOTE:
• Turning on the projector will reset the previous correction setting values and correct distortion anew if the projection angle is
changed from the last use.
If the projection angle is the same as in the last use, the previous correction setting values are retained in the memory.
To use the previous correction setting values after changing projection angle, select [Manual] in [Keystone] from the menu.
( page 77)
• To reset the 3D Reform correction setting values, press and hold the 3D REFORM button for a minimum of 2 seconds.
• Each time the 3D REFORM button is pressed, the item will change as follows: Keystone
...
For information on [Cornerstone], see "Correcting Horizontal and Vertical Keystone Distortion (Cornerstone) on page 38.
• The 3D Reform feature can cause an image to be slightly blurred because the correction is made electronically.
3. Projecting an Image (Basic Operation)
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Cornerstone None Keystone