EXCERPT page containing first few paragraphs. 2019-12-11 22:53:10
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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.
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 in infrared, which do not change. It is not a review of any particular camera or lens, though many examples are included.
- 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.
Canon EF 85mm f/1.2L II flare