The Pentax 40mm f2.8 DA Limited Lens Black is an ultra-slim and lightweight K-mount prime lens offering an equivalent focal range of 61mm in 35mm film format. The limitation of a fixed focal length (40mm) allows you to see the world from one perspective, encouraging you think outside the box and become more creative with your photography. The Pentax Limited series lenses are renowned for their hand-machined, well-built aluminium body, outstanding image quality, HD coating and a round-shaped diaphragm for a beautiful out-of-focus effect. This lens is The Pentax 40mm lens is ideal for general purpose photography and is a great choice for creative photographers who want to keep things light whilst on the move.