Beware the “hot spot,” particularly with wider-angle lenses, like in this 18mm image at New Mexico’s Plaza Blanca. The uneven darkening of the sky from clumsy use of a polarizer can be difficult to remove.

Beware the "hot spot," particularly with wider-angle lenses, like in this 18mm image at New Mexico's Plaza Blanca. The uneven darkening of the sky from clumsy use of a polarizer can be difficult to remove.

Beware the “hot spot,” particularly with wider-angle lenses, like in this 18mm image at New Mexico’s Plaza Blanca. The uneven darkening of the sky from clumsy use of a polarizer can be difficult to remove.