I have been vocal about my dislike for dome cameras that have IR's installed inside the dome which in time cause all sorts of picture quality issues in low light conditions due to spider webs and other foreign objects that come to rest on the dome and reflect the IR back into the camera lens. You get the picture!! (or not in this case!!)
Here is a logical and worthy solution.......New Design for IR Dome Cameras
I hope the big brands are paying attention!