Pentax DA Limited 40mm f2.8 Camera Lens (Black)In the world of photography the 40mm lens is the absolute must have for any collection. This lens has a fixed focal range of 40mm and is absolutely perfect for an array of uses such as portrait, wedding, detail shots, beautifully manipulated depth of field shots and so much more. By keeping the focal range fixed, this lens allows for a much wider aperture range, this is what allows for the depth of field focus manipulation and the wonderful shots