Phase One 11.8mm Auto Extension Ring

The Phase One Auto Extension Rings lets you easily convert your lens to a more close up view for macro photography.

Electronic Aperture:
It will convert your lens to manual focus, but a set of electronic contacts ensures transfer of lens aperture ans focal point to the 645 camera.

High quality:
The Auto Extension Ring bayonet is made from precision crafted and durable hard metal with firm and easy lock connection to both the lens and camera