Pentax 1.7x SMC Pentax-F AF Adapter - Accessory

Autofocus teleconverter made for K mount SLRs by Pentax. It multiplies the lens' focal length by 1.7x in exchange for some light transmission (1.5 EV). It can also allow manual focus K mount lenses to be used with autofocus as long as the camera has a built-in screw focus motor. The adapter does not transmit focal length information from the lens to the camera. It will work with any K mount lens back to the Pentax-K and Pentax-M series as long as their maximum aperture is equal to or faster than f2.8. Metal body available in black.

• Pentax 1.7x Teleconvrter SMC Pentax-F AF Adapter (6 elements, 4 groups)
• Size: 64 x 26 mm
• Weight: 135g