Description: There is no finer lens than the FD 15 mm f/2.8 for the photographer wishing to have the impact of a fisheye with a full-frame image. Its remarkable speed makes it ideal for color photography under poor lighting conditions. The front element is strongly curved hence its filters are of the built-in type which can be easily switched by rotating the filter ring on the lens barrel. There are four filters; Skylight, Y3, 01 & R1