A lens position adjustment
system (10) permits adjustment of the position of a
projection lens (5) relative to a
projector (100) for making a Scheimpflug adjustment. The
projection lens (5) has an
optical axis (6). The
system (10) comprises: a first support part (20) for fitting to, or forming part of, the
projector (100); a second support part (40) for fitting to, or forming part of, the
projection lens (5); and a connecting part (30). The connecting part (30) is pivotally connected to the first support part (20) and pivotally connected to the second support part (40) and configured to permit independent adjustment of the second support part (40) relative to the first support part (20) about two axes of rotation (7, 8) which intersect, and are perpendicular to, the
optical axis (6) of the projection lens (5). A
locking mechanism (28, 29, 51-58) is provided for securing a position of the second support part (40) relative to the first support part (20).