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Focusing for Infrared
Unlike the Canon 5D, use of filtration does not improve focus on the Nikon D70 (or Nikon D200).
Manual focus must be used for manual-focus lenses—
Manual focus adjustment used the infrared adjustment mark (if present), or a best guess if not.
LCD zoom “focus” (not used for these tests) means taking more than one frame, then using the camera’s LCD to zoom in to maximum magnification, then making a focus adjustment. This process is repeated until the best result is obtained. It’s not always obvious what the best result is, which means one might adjust the focus and find that the prior focus was better—in which case one must try to achieve the previous focus a 2nd time, a sometimes frustrating task with the overly-sensitive focusing rings on many autofocus lenses.
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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.