EXCERPT page containing first few paragraphs. 2018-07-22 21:21:12
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See also the Mireds and Color Temperature Table.
This page uses a SpyderCHECKER® color checker card to evaluate the difference in white balance and tint between f/1.4 and f/2 with the Sigma 105mm f/1.4 DG HSM Art, using Photoshop/ACR raw file conversion.
The difference is significant with the resulting sickly yellow-green hue if the same white balance and tint are used for f/2 and other apertures as for f/1.4. Exact figures are given for white balance and tint, but what one does for f/1.6 and f/1.8 is an exercise left to the diligent reader.
What a JPEG shooter can do about this color shift is not much, if the choice of aperture changes. Otherwise, compensation can be dialed in, once one discovers how the D850 auto white balance behaves and/or fixed white balance. Shooting a gray card (in focus!) is thus advised for JPEG shooters.
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