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EXCERPT page containing first few paragraphs. 2019-12-11 22:53:10

Lens Flare

Lens flare is a distinctly different problem from a lens hot spot. A true hot spot is caused by a reflection between the lens elements and the sensor (or sensor glass), and will be centrally-located. Flare is a problem with both visible-light photography as well as infrared photography. Hot spots are usually only a problem only with infrared photography, though certain older lenses can exhibit hot spots in visible light due to the unfortunate reflections between the sensor and lens elements.

Example—Canon 85mm f/1.2L II USM

The image below shows strong flare (Canon EF 85mm f/1.2L II USM). A 50-watt Solux halogen bulb was placed just outside the frame, showing that the lens hood was insufficient to block the stray light—always shield the lens as much as feasible.

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Canon EF 85mm f/1.2L II flare

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