ZWO EFW User manual

苏州振旺光电有限公司
Suzhou ZWO Co., Ltd.
EFW
Quick Guide
Thank you for purchasing a ZWO Electronic Filter Wheel (EFW). This manual will
introduce you to your EFW and prepare you for the first use. Please take the time to
thoroughly read this Quick Start Guide and if you have any additional questions, please
contact us at [e-mail]

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. AZWO 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.

For 31mm, 36mm & 51mm unmounted filters: (Please use the M2 screws and masks to fix the filters, which are
included in the package.)
⚫Remove the screws securing the back cover and remove the back cover
⚫Place filters onto the filter positions.
⚫Use the included M2 screws with masks to secure the filters in place.
⚫Replace the back cover and tighten the screws.
Connecting ZWO EFW to Camera
You can connect your camera to the EFW with a 1.25" nose piece or simply thread it directly to the M42
interface. Please pay attention to the direction of EFW when you connect to the camera to ensure that the filters
are as close to the sensor as possible to minimize the chance of vignetting.

Driver installation
ZWO EFW are designed as a USB HID device (like a keyboard or mouse) so you only need to install the
ASCOM driver for use.
Download and install EFW ASCOM driver from our website or install from the CD-ROM that is included with
your EFW. Important: Make sure you install the ASCOM platform first.
Most astro imaging software supports the ZWO EFW through ASCOM, such as Sharpcap, Firecapture, MDL,
SkyX, SGP,APT, etc…You can also operate the EFW through theASCOM dialog window.
Please read our ZWO EFW Software Manual to learn more about how to use it with various software and

operating systems.
https://astronomy-imaging-camera.com/manuals/
Trouble shooting common problems with your EFW:
1. My EFW tries to move but gets stuck and cannot arrive at the right position.
1) Filter is too thick: Filters (not including the threads) must be less than 7mm in thickness and threads must
be less than 3mm in thickness.
2) The M2 screw used to secure the filter is too long and
causes the wheel to jam.
3) The M42 thread of the scope or the camera is too long
and protrudes into the filter wheel, hitting the filter or wheel,
causing it to jam.
2. My EFW spins but never stops, or stops at
the wrong position.
ZWO EFW uses an infrared sensor to check wheel position. If the sensor malfunctions, you can usually
resolve by recalibrating the EFW in the ASCOM driver. Simply click "ReCalibrate" in ASCOM driver interface. It
can take up to 60 seconds to perform this action.
If this does not resolve your problem, contact us at: [email protected]m
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苏州振旺光电有限公司
SuZhou ZWO Co,. Ltd.
Tel: [phone]
Website: https://astronomy-imaging-camera.com
E-mail: [e-mail]
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