Introduction
Electronic filter wheels (EFW) are filter wheels used with mono cameras for astrophotography. ZWO offers
several configurations depending on the filter size and number of filters used. A ZWO EFW simply requires a USB
connection for use and power. You may control it from a variety of hosts such as Windows , Arm Linux , Android
and iOS system.
Four configurations of the ZWO EFW are currently available:
⚫ 5 Position: Accepts 1.25” or 31mm Filters
⚫ 5 Position: Accepts 2” or 51mm Filters
⚫ 7 Position: Accepts 36mm Filters
⚫ 8 Position: Accepts 1.25” or 31mm Filters
Installation of Filters
1.25″ & 2" size mounted filters: (Please note that filters must be less than 7mm in thickness (not including the
threads) and threads must be less than 3mm in thickness.)
⚫ Remove the screws securing the back cover and remove the back cover.
⚫ Set the wheel on a flat surface with the face down.
⚫ Screw the filters into the threaded wheel positions.
⚫ Replace the back cover and tighten the screws.
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