In general, even when common practices are public and known, if a patent describes specific steps or processes, the prior art isn't considered.
Keep in mind that anyone who has the slightest difference in their process to the patent means they aren't infringing on the patent. Obviously, a lawyer could always go after someone or another company that uses a similar process.
If you have a huge difference in the process, you can be found to infringe the patent because if the look is same.
The patent isn't exact, it is all "abouts" from ISO to F-stop.
But the good thing is, that patent would be totally useless in any other countries court rooms (I wish...)
If going step by step the patent, it is very common way to shoot and light in studio or stage.
If really wanted to be accurate, the patent should tell exactly every distance and angle, light power, light source angle, color temperature and lots of very very scientific measurements what anyone would need to replicate the results to get similar ones.