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Canon EF 15mm f/2.8 fisheye
Always a fun lens to shoot, it offers high sharpness and modest hot spot problems. Corner and edge sharpness aren’t so great (as with visible light shooting).
Canon 15mm f/2.8 fisheye hot spots
Field testing suggests moderate hot spots becoming a concern at f/8. Specular highlights and high-contrast situations are best avoided. However, avoiding the blue channel can often eliminate any hot spot at f/8. In general, quite respectable and usable hot spot performance.
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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.
Bjorn Rorslett stalking for the shot
A faint central hot spot is visible (15mm fisheye, f/8)