Hello everyone! I`m new in this beautiful world of photography. I recently purchased a Pentax K100d camera and i was looking forward to use it. I also purchased a 50-200mm lens and a 18-55mm lens also from Pentax. Unfortunately i soon realised that it might be a problem with my camera. After taking some pics during a trip, for the first time with this camera, and developing them with PS CS3, some horizontal orange bands were prezent in several of the pictures, regardless the lens i used. I`d say that 20-30% from aprox 200 pictures i took have this problem. I can`t see a pattern. They tend to appear both in strong and low light. The distance between them is not equal as well as their width. Sometimes they appear as a single or multiple horizontal dark lines. Please, if you are familiarised with these kind of problems, let me know what is it, before i`ll send it back to Pentax.