I guess I need to swat up on terminology because I don't understand. I have a canon 40d old DSLR and know a little but don't understand auto def and how to get better colour capture.
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My Olympus DSLR is about the era as your 40d.
Well it is fairly simple.
Your camera has White balance settings on it you need to learn how to use it. Look
HERE for an explanation.
Your camera sees this kind of light as a bad colour cast and tries to correct it. You can try and correct it in camera by setting the white balance to sunny or cloudy or even shade. I leave my WB on auto shoot in RAW format and process my photos in Photoshop. I do this rather than let the camera decide what to set things too I make the adjustments the camera normally does myself the way I wanted them when I took the shot.
Try taking pictures of the same scene with different white balance setting to see what happens.
This is the same kind of thing during the printing stage of colour print film.