EXCERPT page containing first few paragraphs. 2019-09-22 01:50:19
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All of Canon’s 50mm lenses have some hot-spot issues, with the 50mm f/2.5 compact macro showing the best performance. However, shooting at apertures up to f/5.6 can provide quite pleasing results.
hot spots (45mm -60mm) summary
Ironically, the Nikon 28-70 f/2.8 zoom fares better than all of Canon’s primes, and all of Canon’s zooms. This is one reason why the Nikon 28-70 f/2.8 was my standard lens on the 5D-IR until the Zeiss IR-Distagon and Coastal Optics 60/4 came along.
Canon’s zooms (at 50mm) also outperform Canon’s primes, a disappointing situation, since hot spots are a real problem with the Canon zooms. To maintain perspective, Nikon’s 50mm f/1.4 and f/1.8 primes don’t fare any better, though the 4-element Nikon 45mm f/2.8P offers exemplary performance.
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Diglloyd Infrared Photography covers cameras and lenses for infrared photography.
The coverage explains all the issues involved in shooting in infrared, which do not change. It is not a review of any particular camera or lens, though many examples are included.
- 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.