A magenta filter will crosstalk more than a red filter, and CC40R or 30R would be easily obtained. Have you tried to make up a filter pack which will equalize the highlight clip position for all three channels in daylight?
Second question - to what extent do you think the IR-cut filters used are attenuating the far end of the red response, and might this be in part responsible for the low red sensitivity?
A magenta filter will crosstalk more than a red filter, and CC40R or 30R would be easily obtained. Have you tried to make up a filter pack which will equalize the highlight clip position for all three channels in daylight?
Second question - to what extent do you think the IR-cut filters used are attenuating the far end of the red response, and might this be in part responsible for the low red sensitivity?