I did not quite expect this as a lot of members including yourself shoot RAW and correct the effects in RAW so failed to explain properly.
I am trying to think in film technology terms. If I move up to D200 or D2X I don't want to add a new PC to the bill immediately, ( currently on 128mb RAM
). So I am now doing everything in JPEG as practice - back to the roots !!
Colour temperature works in reverse of what you may expect - low numbers = warm, and high numbers = cool. Daylight film is balanced for 5500k. So a scene that has a higher colour temperature ( eg overcast daylight ) will be cold, and that with a lower colour temperature ( eg domestic light bulb ) will be warmer.
I think digital sensors must be calibrated around 5500k - 6000k, as my results with electronic flash which is around 5000k do give a slight warming. A similar warming effect could have been achieved with an 81A filter. In this case it was very overcast so flash was really needed.
When I did the Nikkormat I had been doing quite a bit of RAW and failed to notice that I had an 81A filter on the 105mm lens. Realised this soon after posting my behind the scenes. Did not go back and comment for fear of confusing things, but now the subject has come up ......
I will look on the net and see if there is something worth posting a link to.
I will attatch the two images here appropriately titled. Quite a difference.
Don