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Manual Focus
For most landscape work, careful manual focusing is the preferred way to operate, since there is frequently at least a slight focus error with autofocus, and even a slight error can greatly reduce resolution.
Stopping down, even to f/8, frequently will not correct “minor” focus errors. For some subjects this might be tolerable, since the exact plane of focus might not be terribly important to the overall composition. But for others, the difference is that of “crisp” vs “slightly soft” or “very soft”. Shooting a 10 or 12-megapixel DSLR and then being satisfied with slightly soft detail (eg the equivalent of 3 megapixels) makes little sense.
Manual-focus procedure
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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.