A polarising filter can reduce some reflections and change how parts of a scene render.
See through certain surface reflections or control glare.
Rotating the filter changes its effect on reflected light. Results depend on the surface and viewing direction; a blue sky can darken unevenly across a very wide view.
Observe a reflection in a window or on water while rotating the filter.
The effect is not universal across surfaces and angles. Check the image as you rotate rather than assuming glare disappears.
Follow a connection to understand how these ideas fit together.
Controlling some reflections can reveal a subject behind them.
Polarisation can darken different parts of a wide sky unequally.
Conditions: The effect depends on the viewing direction relative to the sun.
Source check: . This records a check of the supporting references; it is not an expert endorsement.
A polarising filter can reduce some reflections and change how parts of a scene render.
Rotating the filter changes its effect on reflected light. Results depend on the surface and viewing direction; a blue sky can darken unevenly across a very wide view.