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Hot Spots and Levels/Curves in Photoshop
The image below was shot with the Canon EF 24-70 f/2.8L at f/11. The lens hood was used. In this case, it becomes difficult to distinguish a hot spot from plain flare. However, it is the central area which is affected most, so flare is likely only a contributing factor.
Shown below is the image as it was processed from Digital Photo Professional. A very low contrast image, it requires some degree of tonal manipulation—either Levels or Curves, though not to the degree shown here, as the effect of the soft fog is lost when contrast is added.
The original image is marred by a faint, but noticeable discoloration. It is likely a combination of both flare and 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.
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As processed from Digital Photo Professional