Canon EOS D60 Service Manual page 55

Part 2: Technical Information
4) Countermeasures for red ghosting
With the EOS D30, when there was a strong light
source within the picture, red ghosting would appear
symmetrically or near the light source depending on
the shooting conditions. In the EOS D60's Low Pass
Filter (LPF) assembly, by switching to a hybrid
construction consisting of the optical low-pass/IR cut
filter, the dichroic mirror with a new coating that
changes the spectral transmittance in front of the LPF
and the IR absorption glass with new absorption
characteristic behind the LPF, the red ghosting problem
has been almost completely resolved.
Fig. 2-3 LPF construction.
2-2