Introduction
Electronic filter wheels (EFW) are filter wheels used with mono cameras
for astrophotography. ZWO offers several configurations depending on the
filter size and amount of the 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 PC or Arm Linux or Android smart phone.
Three configurations of the ZWO EFW are currently available:
⚫ 1.25”: EFW mini 5 position, EFW 8 position
⚫ 36mm: EFW 7 position
⚫ 2”: EFW 5 position, EFW 7 position
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.
For 31mm, 36mm & 51mm unmounted filters: (Please use the M2 screws
and washers to fix the filters, which are included in the package.)
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