Kodak DCS 300 Series User Manual page 202

If you remove the antialiasing filter and don't re-install it, you should store it in a clean,
dust-free space.
11-4
3
Carefully unscrew the screw at
the bottom of the antialiasing
filter bracket using a jewelers
screwdriver (Phillips #00).
4
Carefully remove the filter
bracket from the camera.
5
Gently blow off the dust using
commercially available "canned
air." If the antialiasing filter is
still dirty, please contact your
dealer or service representative.
6
To re-install: place the filter
bracket tabs into the upper two
notches on the camera lens
opening, and secure the screw at
the bottom.
7
Replace the lens.
Refer to "Mounting the Lens"
on page 1-19.