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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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Diglloyd Infrared Photography covers cameras and lenses for infrared photography.
The coverage explains all the issues involved in shooting for monochrome and in infrared. It is not a review of any particular camera or lens, though many examples are included.
- Monochrome vs color cameras.
- Post processing for monochrome.
- Guidance on workflow for infrared, including black and white and channel swapping for false-color images.
- How infrared renders, and why certain spectral cutoffs matter: false color vs black and white.
- Image quality issues to be on the lookout for in infrared.
- Numerous lens evaluations in infrared.
View an overview of infrared as well as filter spectral transmission plus examples from an optimal lens.
Canon EF 85mm f/1.2L II flare