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EXCERPT page containing first few paragraphs. 2019-05-26 17:18:51
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Canon EF 50mm f/1.4

I’ve owned two samples of this lens, and both were disappointing, and alas the 2nd sample is more disappointing than the first (which I no longer own). Performance in infrared at f/1.4 and f/2 is adequate but not impressive, with a halo effect that might be uncorrected spherical aberration. While build quality is better than the plasticky 50mm f/1.8, save your money and start with the US$99 50mm f/1.8, or go straight to the US$1500 50mm f/1.2L.

Backfocus and hot spots are much more of a problem with the 50mm f/1.4 than with the 50mm f/1.8. This lens should not be stopped down beyond f/4 for infrared, a tough sell, given its backfocus behavior.

EF 50mm f/1.4 hot spots

Very strong hot spots when stopped down.

Canon 50mm f/1.4 backfocus

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Diglloyd Infrared Photography covers cameras and lenses for infrared photography.

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