The ZWO EFW 7 × 36 mm (2025 version, ZWO-EFW7X36-25) is a next-generation electronic filter wheel designed for precise multi-band astrophotography. Its improved internal structure reduces light leakage through enhanced sealing, dual side barriers, and a fully enclosed motor compartment. The high-precision stepper motor ensures stable, repeatable filter positioning, while the USB-C interface provides reliable plug-and-play operation with no drivers required. The wheel holds seven 36 mm filters and maintains a compact optical thickness of 20 mm, making it suitable for imaging systems with limited backfocus.

Key features

• 2025 version featuring an improved anti light-leak structural design
• accommodates 7 filters (36 mm)
• optical thickness: 20 mm
• weight: 515 g
• USB-C interface for power and communication (120 mA @ 5 V)
• high-precision stepper motor for accurate indexing
• CNC-machined aluminum body; 6061 aluminum filter carousel
• fully compatible with ZWO 36 mm filters
• compatible with ASIAIR, ASIStudio, ASCOM, and ZWO SDK
• true plug-and-play operation – no drivers required
• fully enclosed motor compartment and sealed lateral interfaces

Included items

• ZWO EFW 7 × 36 mm (2025 version)
• 7-position internal filter carousel
• USB-A → USB-C cable
• filter mounting screws
• hex key
• user manual

Technical specifications

• model: ZWO EFW 7 × 36 mm (2025)
• number of slots: 7
• compatible filters: 36 mm
• optical thickness: 20 mm
• weight: 515 g
• power consumption: 5 V via USB-C (120 mA)
• interface: USB-C
• body material: CNC-machined aluminum
• carousel material: 6061 aluminum
• motor: high-precision stepper motor
• anti-light-leak protection: enhanced sealing + enclosed motor housing
• software compatibility: ASIAIR / ASIStudio / ASCOM / ZWO SDK
• drivers: not required (plug-and-play)