The ZWO EFW 7 × 2" (2025 version) is a next-generation electronic filter wheel designed for large-format astrophotography setups requiring 2" narrowband and broadband filters. Its upgraded internal structure reduces light leakage through enhanced sealing, dual side barriers, and a fully enclosed motor chamber. The wheel supports seven standard 2" (50.4 mm) mounted filters and also accepts **50 mm unmounted** round filters. With an optical thickness of 20 mm and a robust USB-C interface, it integrates easily into imaging systems with limited backfocus while maintaining fully plug-and-play operation.

Key features

• 2025 version with improved anti light-leak structural design
• 7 filter positions for 2" (50.4 mm) filters or 50 mm unmounted filters
• optical thickness: 20 mm
• weight: 720 g
• USB-C interface for power and communication (120 mA @ 5 V)
• high-precision stepper motor for stable and repeatable indexing
• CNC-machined aluminum body; 6061 aluminum filter carousel
• compatible with ZWO 2" filters and 50 mm unmounted filters
• works with ASIAIR, ASIStudio, ASCOM, and the ZWO SDK
• true plug-and-play — no drivers required
• dual-side sealing and a fully enclosed motor compartment

Included items

• ZWO EFW 7 × 2" (2025 version)
• 7-position filter carousel
• USB-A → USB-C cable
• filter mounting screws
• hex key
• user manual

Technical specifications

• model: ZWO EFW 7 × 2" (2025)
• number of slots: 7
• compatible filters: 2" (50.4 mm) and 50 mm unmounted
• optical thickness: 20 mm
• weight: 720 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 design: improved sealing + enclosed motor housing
• software compatibility: ASIAIR / ASIStudio / ASCOM / ZWO SDK
• drivers required: none (plug-and-play)