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Use this adapter in combination with a Wide T-ring to minimize vignetting of images on a 35mm film frame in prime focus photography. Less vignetting occurs than when T-ring is coupled to standard 43mm or 36.4mm adapters. The threaded side of this adapter screws into the focuser drawtube, while the flanged side fits into the Wide T-ring (with inner ring removed per instructions) attached to the camera.