"This Kipon brand adapter mounts medium format Pentax 645 series lenses on 35mm format Pentax K (PK) mount SLR and DSLR camera bodies to take advantage of the best of the generations of this timeless manufacturer. Your favorite Pentax 645 lenses easily fit, lock securely and perform just like they were Pentax K lenses. There are no interfering glass elements to spoil the excellent Pentax optics. These outstanding medium format lenses have plenty of resolution to satisfy DSLR high resolution sensor's pixel size even at the widest open aperture. Pentax is famous for contrast, flare resistance, color saturation and bokeh and is in a class of its own compared to the best glass that Asahi Optical/Pentax had to offer.The lens adapter has a manual linkage for aperture operation and relates aperture settings to the camera body. Even though no camera to lens automation or link exists within the adapter, depending on the Pentax K mount camera you mate with, the connector can provide aperture priority or manual shooting modes, as well as stop-down metering, for exposure control. While infinity focus is retained in this design, only manual focusing is possible. All KIPON adapters undergo the CNC turning center procedure during manufacturing to provide photographers with only the utmost precision and quality.|Transparent Adaptation of Pentax 645 Lenses to Pentax K Camera Bodies|Securely Mates Lens to Camera|Precision Machined Parts|Smooth and Stepless Manual Aperture Link|Maintains Infinity Focus"