An important diffraction effect in infrared photography.
During a study of bruising, a strange effect was observed on the black-and-white infrared record. This took the form of a circular area of density, in the centre of the contusion, which lasted throughout the life of the bruise. Investigations revealed that the newer 105 mm f/2.8 Micro-Nikkor lenses were the cause, exhibiting unacceptable diffraction at apertures smaller than f/11.
Nieuwenhuis
G
G
Educational Resource Centre, Royal Children's Hospital, Melbourne, Australia.
D003288:Contusions / Q000473:pathology; D006801:Humans; D007259:Infrared Rays; D007909:Lenses; D008297:Male; D010781:Photography / Q000295:instrumentation*; D012867:Skin / Q000473:pathology