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Chapter 3 Basic Operations — Projecting
ENGLISH - 53
Adjusting the lens mounter when the focus is unbalanced
Focus balance
Relationship between the tilt of the lens and the screen focus surface
When the projection lens is tilted in contrast with the image forming surface, tilting the front side (screen side) of the projection lens downwards
(in the direction of the dotted arrow line), the upper side of the screen focus surface will tilt inwards and the lower side will tilt outwards as
shown in the example.
Projection lens
Image forming surface
Screen focus surface
How to adjust the focus balance (adjustment by tilting the lens mounter)
When the entire screen surface is not uniform even if the focus has been adjusted, the lens mounter has focus adjustment screws in three
locations.
f Tool used: Hex driver or Allen wrench (diagonal 2.5 mm (3/32"))
f The Allen wrench is included with the projection lens ET-D75LE6, ET-D75LE8.
Lens mounter structure
Focus adjustment screws (a), (b), and (c) can be turned to move the lens mount bracket back and forth.
Also, tightening the xed screws locks the lens mount bracket in place so it does not move.
When a projection lens with a large weight is installed, or when the projector is installed on an inclination, the lens may tilt and the focus may
become unbalanced. In these cases, perform adjustment by referring to the relationship between the adjustment location and adjustment
screws.
r Front view diagram of the lens mounter (viewed from the screen side)
(a)
(b) (c)
Lens mount bracket
Fixing screws
Note
f Focus adjustment screws (a), (b), and (c) are adjusted with the lens attached.