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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.
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.