Zone Plate 13 zones f/52 for Skink Pinhole Pancake for 4/3

Description

Zone Plate 13 zones f/52 for Skink Pinhole Pancake for Fourthirds   DESCRIPTION: Unlike a pinhole which refracts light when creating an image, the zone plate is diffracting it which results in a softer focus with an infrared-like glow along bright edges with strong contrast. This effect is used in creative portrait and landscape photography. Zone plates are made up of alternating opaque and transparent concentric rings. For optimal sharpness the size of the rings has to be calculated to match a given focal length, which is the distance between film / CCD and the zone plate itself. A greater number of zones yield faster exposure times and more glow effect but it happens on the expense of image sharpness. The zone plate offered here has been individually exposed and developed on high-contrast film. It is designed for use with the Skink Pinhole Pancake installed into a camera (digital or film).   SPECIFICATIONS: Focal length: 37 mm Number of zones: 13 Center zone: 271 µm Light wavelength: 550nm Resulting aperture: f/52 Angle of view (full frame): 60° For protection and easy handling, the zone plate comes installed in a brass / laminate sandwich with 20mm diameter to fit into the Skink Pinhole Pancake   DELIVERY INCLUDES: 1x zone plate mounted in brass shim

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