ZWO Electronic Filter Wheel EFW Gen2 - 7 x 36mm

Anti Light Leak Engineering

Long exposures demand strict control over stray light. The Gen 2 EFW introduces several structural improvements.

Upgraded Sealing Structure

A redesigned slot fit chassis tightens the interface between the top and bottom covers, reducing potential ingress points.

Dual Light Blocking Pads

New lateral light blocking pads add an extra shield, helping maintain clean, uniform frames during long integrations.

Fully Enclosed Motor Compartment

The motor housing is now sealed, increasing both light isolation and environmental resistance for more stable, long term operation.

Filter Compatibility

• 36mm Round Filters: Compatible with unmounted filters that are 1.5 to 3.5 mm thick

Automated Filter Switching

The motorized, bidirectional system enables fully automated filter changes. When paired with ASIAIR or other supported software, the EFW can change filters seamlessly during a scheduled sequence. This is ideal for unattended, multi filter imaging sessions.

Software Support

The motorized, bidirectional system enables fully automated filter changes. When paired with ASIAIR or other supported software, the EFW can change filters seamlessly during a scheduled sequence. This is ideal for unattended, multi filter imaging sessions.

• ASIAIR
• ASIStudio
• ASCOM
• ZWO SDK

Refined Exterior and Interface Upgrades

• Cleaner, more modern look with laser engraved details
• Streamlined exterior for a cohesive, professional appearance
• USB C interface replaces the legacy USB B port for a more robust, reliable, and convenient connection

Lightweight, Rigid Construction

• CNC machined aluminum alloy body for excellent strength at lower weight
• Internal filter carousel made from 6061 aluminum alloy for durability and smooth rotation
• High precision stepper motor ensures consistent indexing and long term reliability