The B&W Soft Spot filter produces a clear circular section in the center of the image where the details of the subject are reproduced in sharp focus. The surrounding area does not go completely out of focus but remains visible in softly flared contours with a slight whitening of colors.
This filter fits the Lindahl Bell-O-Shade holder. It is glass and is mounted in a frame that measures 3 x 4 x 1/4".