The Cokin Softspot filter has a clear spot in the center and allows for the portrayal of an object in a noticeably softer surrounding. The portion outside of the image center will be reproduced less sharp than the center. The filter effect is directly influenced by the f-stop and the focal length. The transformation is softer with wider apertures. The size of the clear circular area increases relatively with the selection of longer focal lengths.
The exposure determination should be done without the filter.
This filter measures 66 x 72mm and fits the Cokin A series holder.