The Cokin A077 Center Spot Wide Angle Blue filter provides a larger center spot area than previous Cokin Center Spots. The filter has a clear spot in the center and allows for the portrayal of an object in a blue colored surrounding.
This filter measures 66 x 72mm and fits the Cokin A series holder.
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; If the camera has the capability of spot-metering, then one can measure with the filter in place