Hotshoe laser sight

thingiverse

When it's dark and you're shooting with a long lens, trying to figure out exactly what your camera is aiming at can be a real challenge. To make things easier, you can attach a low-cost green laser pointer to the camera. This device, such as the Powerful 5mW 532nm Green Laser Pointer, which can be purchased on websites like DX.com, allows you to see exactly where your lens is pointing.