William Optics M48 Nikon F T-Ring - Black - TM-NK-F-M48 threedaysale The Calcium K modules line

The Calcium K modules line is centered at 393

Optical Design: Includes one ED element

Unique features such as an electronic friction break and power down memory allow the mount safely stop and resume a GoTo slew or continue tracking even after an abrupt power loss (No need to realign and start from the beginning)

It works on the difference between Ambient Air Temperature and the temperature of your optics

you can power and control the focus motor from your computer's USB port

William Optics M48 Nikon F T-Ring - Black - TM-NK-F-M48 threedaysale The Calcium K modules lineWilliam Optics 48 mm T Ring for Nikon F Cameras Use this aluminum black anodized T ring to attach your Nikon F camera body to an imaging accessory, etc. with M48 threads.