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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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Bjorn Rorslett stalking for the shot
A faint central hot spot is visible (15mm fisheye, f/8)

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