The Phase Fresnel (PF) lens element effectively compensates for chromatic aberration and ghosting when combined with ordinary glass lens elements. Utilising a Phase Fresnel lens element allows Nikon engineers to use fewer lens elements, resulting in a more compact and lightweight lens.
Chromatic aberration compensation with the PF (Phase Fresnel) lens
1. The longer the wavelengths, the farther the focal point.
2. The shorter the wavelengths, the farther the focal point.
3. Mutual cancellation compensates chromatic aberration.
Conceptual image of the appearance of the PF (Phase Fresnel) lens. The lens appears to have a series of concentric circles engraved onto it.
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 coloured flare may occur according to shooting conditions. This phenomenon can be minimized with ‘PF Flare Control’ included in NX Studio.
PF Flare Control applied