I know that as an Adbobe profile for this lens doesn't exist, one would have to either create their own one or use an alternative ie, for example the ASPH version provided by Adobe. What a shame, the Adobe profiles for the Biogon and Sonnar lenses work wonderfully, it would be great if only Adobe provided one for the Summicron iv, but alas they don't. So how do my fellow Summicron iv owners on this forum apply their lens profiles (maybe you don't?). I'd be interested to hear.