Sletten is a private event for us, by us, and of course, every participant is allowed to take pictures for their private use or things like Facebook. However, we ask that you be mindful and respectful of both the people and the atmosphere we are trying to create and maintain.
Slipping out a mobile phone to catch a great memory is fine. Lugging around a huge DSLR camera and bag everywhere is not. And if you plan on using your pictures commercially, selling or otherwise, that is a different story and will fall under the following rules.