Stained Glass Windows are one of the most amazing sites in churches in Spain. They are often truly beautiful, but hard to photograph as it is too easy to over expose the window. To fix this, set the camera to spot meter, and ensure the spot metering point on the centre of the frame is inside the window, and your shot should come out perfectly. If you want to recompose, take a reading from the window, switch to M (Manual) exposure and set the shutter speed and aperture. Then recompose and shoot. Perfect results every time.