I noticed a problem with my Sony A7R4 and 100-400mm lens, it complained my camera and lens wasn’t detected. Selecting them manually worked. My Canon Kiss-M with 15-45 kit lens was automatically detected. I’ll need to look into why I had an issue with my Sony, but it will normally be an issue with lensfun/exiv2 rather than darktable itself… (I’m using Manjaro Linux, but Mac OSX is likely to behave the same)