I took this picture yesterday in the Salisbury Cathedral in England as my Paris/London photo tour was coming to an end. I pointed my 14mm ultra wide angle lens straight upward, and that meant that in order to look at the LCD screen on the back of the camera, I had to twist my head and neck in a painful and awkward way. To prevent that, I had brought along a 90 degree angle finder. This is an special eyepiece that fits onto the camera, and it allows you to look into the viewfinder at a perpendicular angle to the lens axis. What this means is that I could look straight ahead (at an angle parallel with the floor) while the camera was pointed at the ceiling of the cathedral. This made the composing so much more comfortable.
This is an HDR image with three frames composited together.