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Canon EF 135mm f/2L

Outstanding sharpness and a reference lens in terms of being totally devoid of hot spots.

However, even minor focus errors destroy sharpness. As a result, this is a slow-working lens; manual focus adjustment is needed to obtain critically sharp images. Stopping down, even to f/8, is not adequate to compensate for focus error. For quick grab shots, the lens only rates “Usable”, and then only if filtration is used to mitigate the focus error; otherwise it becomes “Troublesome”.

Canon 135mm f/2L hot spots

Exemplary performance—a beautifully uniform image, and fitting for what might be one of Canon’s finest lenses. Keep in mind that there is no guarantee that certain high-flare or specular-highlight shooting conditions might not generate a hot spot.

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Diglloyd Infrared Photography covers cameras and lenses for infrared photography.

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  • Image quality issues to be on the lookout for in infrared.
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