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Phase Fresnel (PF) lens elements effectively compensate for chromatic aberration and ghosting when combined with ordinary glass lens elements. The PF lens element is based upon the Phase Fresnel lens, which appears to have a series of concentric circles engraved onto it. Utilizing a Phase Fresnel lens element allows Nikon engineers to use fewer lens elements, resulting in a more compact and lightweight lens. Due to the characteristics of a PF (Phase Fresnel) lens that utilizes the photo diffraction phenomenon, when there is a strong light source within the frame or when light enters the lens from outside of the frame, ring-shaped colored flare may occur according to shooting conditions. This phenomenon can be minimized with “PF Flare Control” to be included in Capture NX-D (ver.1.1.0 or later).
Given all that Nikon has put into this new 300 F4, moreover, at this price range ($2000) it is a winner in my book.
The VR has a "sport" mode? Any other lenses have that? Also this is an E lens with an electronic aperture control. Nice.
The E designation indicates the lens itself has a powered aperture (as does the 800mm f/5.6). Speculation has been that Nikon would eventually move from G to E type of aperture activation over time, as the demands of video make Nikon’s old mechanical style aperture changes slightly problematic. The PF is Nikon’s version of Canon’s DO (diffraction optics). PF stands for Phase Fresnel, which is a type of lens element that works to correct chromatic aberration, at the slight expense of vulnerability to flare.
An electromagnetic diaphragm mechanism in the lens barrel provides highly accurate electronic diaphragm or aperture blade control when using auto exposure during continuous shooting. With conventional D/G type lenses, the diaphragm blades are operated by mechanical linkage levers.