My next natural question is why does CaptureOne add differing doses of default sharpening for different ICC profiles
Processing is catered to each raw format that Capture One supports. The amount of human-time that goes into tweaking the algorithms, ICC profile, variables, and defaults of each camera is one of the advantages of Capture One. e.g. Many of our customers find that the profile for the 5DII, coupled with the color/processing engine of C1 is better than the results in LightRoom AFTER they've done the color-checker passport (and far better than the generic 5DII LightRoom profile).
Files that are supported by virtue of being in the DNG format, but which are not specifically catered to will process, and will probably look pretty good, but have not received any special attention/catering.
This is one of my (several) complaints about DNGs. They fool most users into thinking that "compatibility" for raw processing is binary - either raws from Camera X open in Program Y or it doesn't - whereas in reality it's very important (for those who care about processing and smooth workflows) that someone actually sat down with a variety of raw file tests from that camera and adjusted the excellent-but-generic algorithms to get the most out of that file.
It's like the difference between randomly selecting a suit based on a size-range or having a suit tailored to you. Yes they will both fit, but...
Unfortunately since you have a Sinar back your options for raw processors which are catered to your digital back specifically are somewhat... limited. I suppose that's why you're trying to make it work in Capture One and hopefully through phaseone.com you'll be able to work this out. Let us know how it turns out.
How does this effect the appearance of the image in the viewfinder?
The difference in sharpening as shown at zoom-to-fit sounds more like a bug or a limitation caused by DNG to me. Don't know for sure as we don't sell/support Sinar backs. Have you started a support case? Have you tried the most recent version (6.1.1 or 6.2)? The forum is not going to be able to help you much more - especially since you haven't posted any screen grabs to show a quantification of the difference. I think your best bet is the support system at phaseone.com.
Doug Peterson (e-mail Me)
Head of Technical Services, Capture Integration
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