William Optics ZWO EAF Mounting Bracket with Clutch for WIFD Focusers

The Clutch: Manual or Motorized Focus

The clutch disengages the ZWO focuser motor from the focuser so you can turn the focus knob by hand, then re-engages it for software-controlled autofocus. William Optics uses a stainless steel, oil-sealed structure for smooth, precise operation. That is handy during setup, when you first look for the approximate focus point with a new camera, or when you want to focus visually at the eyepiece without connecting any software.

Belt Drive, Motor in Line with the Tube

Instead of the stock direct coupling, the bracket uses a belt-driven layout between the motor and the focuser. That lets the EAF sit in line with the telescope tube, for better balance and so you can store the telescope without removing the focuser motor. The bracket is CNC-machined from anodized aluminum alloy, light and rigid.

Check the Mounting Position Before Ordering

The bracket needs clearance for the full height of the EAF, more than 52 mm. Side mounting is therefore recommended, which means rotating the whole telescope tube by 90 degrees. Mounting underneath works only on focusers that are offset from the bottom plate, such as the Ultra-Cat 108 and the FLT120 or larger. On other telescopes you would need a taller riser block; the William Optics riser block is not intended for this. On William Optics focusers other than the WIFD, small dimensional differences may call for a bit of force during installation.

Choosing the Right Version

• Original EAF: for the first-generation ZWO EAF focuser motor.
• EAFN / EAF Pro: for the newer ZWO EAFN and EAF Pro (2025) focuser motors.