Answer by blekenbleu for How is Nikon's PF optics different from and similar...
PF and DO terminologies are nominally interchangeable;Canon holds patents for Diffractive Optics lenses:http://www.cameraegg.org/new-canon-do-patents-500mm-f4-500mm-f5-6-600mm-f4-800mm-f5-6/.. while...
View ArticleHow is Nikon's PF optics different from and similar to Canon's DO optics?
Nikon has just announced a new 300 mm lens featuring a new technology called "PF" or "Phase Fresnel." This has been compared to Canon's existing DO (Diffractive Optics) lenses such as the 400 mm f4 DO....
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