I have a school project for which I need to make a small movie in Blender. All the animations are fine, but the moment my camera gets into the airduct I made, the preview gets all dark and blurry. I tried to set the FOV but it didn't work. In the room before the camera works fine. I also added quite a handful of lights so I don't think it might be the problem.
Anyway here is the render preview. There is a point light just above the cube.