Pentax Screw-K Mount Adapter Special Order DX Coded cassettes mean that

DX Coded cassettes mean that the film speed of ISO 50/18° is set automatically on most cameras

Designed with UD glass to minimize and compensate for chromatic aberrations

Even when just slightly stopped down

This results in a natural appearance of the subject within the image

Leica breaks its own record and introduces the world's highest-speed aspherical lens: the LEICA NOCTILUX-M 50 mm f/0

Pentax Screw-K Mount Adapter Special Order DX Coded cassettes mean thatThis Pentax Lens Mount Adapter allows screw mount lenses to fit on modern K bayonet mount cameras. When used with this adapter, a screw mount (Universal Thread) lens will focus to infinity (cannot be used for automatic diaphragm or open aperture metering). When used on any Pentax automatic camera aperture priority camera automation is retained when using screw mount lenses and accessories.