Getting the white balance right is a big deal with the Sigma DP Merrill cameras. Particularly so because the Sigma Photo Pro software is obtuse in its control of white balance and tint, and the display of the image is not color managed (as this was written). Additionally, SPP is very slow in displaying changes.
The smart move is to use a gray card or similar to get the white balance to a neutral value. Except that it’s not that simple.
Choose a White Balance Setting, then a color adjustment
Even clicking a gray card/cube, the white balance is relative to the White Balance Setting menu.
Clicking that same gray card/cub with White Balance set to Auto vs Original vs Sunlight or etcetera results in completely different results. In short, the Color Adjustment menu is relative to a constrained list of white balance settings, which themselves affect the overall color rendition. Hence it is confusing compared to a conventional camera and raw converter, where one can set white balance and tint as absolutes.
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Since 2009, Diglloyd Guide to Mirrorless covers mirrorless cameras and lenses. Includes interchangeable lens camera systems (Sony, Fujifilm, Olympus, etc) as well as fixed-lens cameras (Sony, Sigma, Ricoh, etc).
In addition to the manufacturer-brand lenses, lens coverage includes 3rd-party lens lines like Zeiss Touit, Zeiss Loxia and Zeiss Batis.
It includes hundreds of pages of exclusive coverage and high resolution, Retina-grade examples for the new mirrorless camera systems from Sony, Fujifilm, Olympus, Sigma, Ricoh and more. Also included are operational concerns, like shutter vibration or other camera behaviors. This publication will play a decisive role in your selection and use of mirrorless cameras and lenses.