Epson ELP-3300 - Manual (Page 40)

21 Focusing and Positioning the Screen Image
The following illustration identifies the different parts of the projector:
foot
foot release button
status lights
input/output
connectors
focus ring
zoom ring
remote control
receiver
operation panel
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, which is the
outside ring on the lens. To adjust the size of the image, rotate the zoom ring,
which is the inside ring. Rotate the zoom ring clockwise to make the screen
image larger or counterclockwise to make it smaller.