> I am an amateur photographer, and I can't understand why the major camera brands (Canon, Nikon, Sony, Fuji, etc.) aren't open at least to the concept of SDK's

> I am an amateur photographer, and I can't understand why the major camera brands (Canon, Nikon, Sony, Fuji, etc.) aren't open at least to the concept of SDK's to control their cameras (let alone opening the lens mount specifications)... At least Canon and Nikon do. I use the Canon and Nikon SDKs in a product for work, and there are plenty of third party applications which allow control of their cameras. They might not officially offer support for them, but they do keep them updated for new cameras and I have had bugs fixed and questions answered. There are open source projects using these SDKs - See NINA [0] as just one example. [0] https://nighttime-imaging.eu/ https://nighttime-imaging.eu/