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Nikon 20mm f/3.5 AI-S
There is nothing particularly good or bad about this lens, and since the 18-200 VR offers considerably more convenience and a wide zoom range, there is little reason to use this prime lens. Brief field tests suggests good, but not great edge and corner performance on the Nikon D70.
Nikon 20mm f/3.5 AI-S Hot spots
Although hot spots appear well controlled, field use suggests otherwise. Some of this effect might actually be more vignetting than seen with most lenses.
Nikon 20mm f/3.5 AIS backfocus
Backfocus is quite strong and focus adjustment is mandatory.
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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.