The areas where the thumb points (90° to the sun) is where the polariser has the strongest effect.
Point at the sun with the forefinger and then rotate your hand at the wrist. The areas where the thumb points (90° to the sun) is where the polariser has the strongest effect. There is lens choice to consider too. If you enjoy ultra-wide lenses such as a 20mm lens on 35mm format, use a polariser – applying the rule of thumb – and you’ll find the central area of blue sky looking lovely and rich while the edges of the frame look unaffected.