Originally posted by froeschle Brightness / exposure, contrast and color cast seem to slightly vary between the images of the K-5 and the K-5 IIs. Comparisons with exact the same settings (ISO, time, aperture, manual WB) would be of interest. Is this discrepancy due to the (lack of the) Bayer AA-Filter? Maybe a K-5 II could help to answer this question.
Bayer filter is the RGB filter infront of the sensor so that we get a coloured picture, that is something else then the Anti Aliasing filter.
So the mkIIs has a bayer filter.
The AA filter basically blur the image about 1 pixels maybe less, this is done so that artifact cause by the Bayer filter won't show up.
The blur is so small that it has little to do with the exposure or contrast of the photo.