FILTER FRAME FOR DIGITAL SINGLE-LENS REFLEX CAMERA

摘要

PROBLEM TO BE SOLVED: To attain various digital camera filters optimum for a digital single lens reflex camera, and to provide a thin-shaped filter frame which is formed so that a vignetting is unlikely to occur, even when mounted on a wide-angle lens, and whose operability is high.;SOLUTION: The filter outer frame 1 for mounting a filter lens 2 is provided with a female screw part 8 for screw-connecting another optical attachment on the front side; the frame 1 is formed so that the female screw outer cylindrical side 9 may slightly project forward over a lens barrel to which the filter is attached; also, the frame 1 is provided with a male screw part 6 which is screw-connected to the camera lens barrel behind the filter outer frame; the filter lens is arranged backward as much as possible; also, arranged together with the male screw outer cylinder constituted of the male screw in the camera lens barrel. Also by engraving a V-shaped groove between a knurlized part formed on the outer peripheral part 11 of the filter outer frame and a knurlized part formed on an outer frame small bevel edge part 13, the knurlized parts, having different knurl pitches, are formed adjacent to each other across the V-shaped groove.;COPYRIGHT: (C)2006,JPO&NCIPI