Epson PowerLite 713c ユーザーズマニュアル

If you place the projector below the level of the screen, you’ll have to 
tilt it up by extending the feet as shown. Tilting the projector upward 
causes the image to lose its rectangular shape, but you can correct the 
distortion by pressing the 

Keystone

 button as described in the next 

chapter. 

If you place the projector level with the bottom of the screen, the 
image will be rectangular and you won’t have to adjust it. If you place 
the projector higher than the bottom of the screen, the image will still 
be rectangular, but you won’t be able to fill the whole screen with the 
image. 

ideal 
height