Hot Spot ThotsHot Spot Thots4 years ago in Photography More Like This
A hot spot is a noticeable color aberration, usually circular, that appears in varying amounts in digital infrared photographs. Some lens and camera combinations seem to be hot spot free, but most lenses show some degree of this problem.
Photographic lenses are not designed with IR in mind. IR focuses differently than visible light. It reflects and diffracts differently than visible light. The lens elements and the inside of the barrel of any given lens may be prone to uncontrolled reflection and diffusion of IR. There may even be reflection from surfaces inside the camera body. Also, different cut-off frequencies of IR filters can reveal differing degrees of hot spotting.
In its most obvious form, the hot spot is an area in the center of the photo that is a contrasting color to the rest of the image, fairly saturated and rendering the elements in that area flat and softer focus. In many cases the hot spot is less obvious and can be managed during post processing.
The most subtle hot s