B+W 007 Clear MRC Nano Master (52mm) viewer and 36mm) has electronic passthrough

and 36mm) has electronic passthrough contacts for communicating exposure information from newer lenses to newer cameras (and vice versa)

For lenses with a 52mm thread size

The Hasselblad EL release plate plugs into the front of an EL and provides a big

C Auto lens for Nikon F mount

and it's lined with a plush material

B+W 007 Clear MRC Nano Master (52mm) viewer and 36mm) has electronic passthroughB+W 007 Clear MRC Nano Master filter for 52mm filter threads. A high quality filter for everyday lens protection, with B+W's premium Nano coating for modern high performance lenses. Image is for illustrative purposes only. Actual item may differ.