The ZWO EFW 5 × 2" (2025 version) is a next-generation electronic filter wheel designed for advanced astrophotography setups that use large 2" filters. Its improved internal structure provides enhanced light-leak protection, helping to maintain consistent calibration frames and stable performance during long imaging sessions. The wheel holds five standard 2" (50.4 mm) filters or—optionally—five **50 mm unmounted** round filters. With an optical thickness of 20 mm and a USB-C interface, it integrates easily into imaging systems with limited backfocus while offering true plug-and-play operation.

Key features

• 2025 version featuring enhanced anti light-leak structural refinements
• 5 filter positions for 2" (50.4 mm) or 50 mm unmounted filters
• optical thickness: 20 mm
• weight: 540 g
• USB-C port for both power and communication (120 mA @ 5 V)
• high-precision stepper motor for accurate and stable indexing
• CNC-machined aluminum body; 6061 aluminum filter carousel
• fully compatible with ZWO 2" and 50 mm unmounted filters
• works with ASIAIR, ASIStudio, ASCOM and the ZWO SDK
• true plug-and-play operation – no drivers required
• enclosed motor chamber and sealed lateral interfaces to prevent stray light

Included items

• ZWO EFW 5 × 2" (2025 version)
• 5-position filter carousel
• USB-A → USB-C cable
• filter mounting screws
• hex key
• user manual

Technical specifications

• model: ZWO EFW 5 × 2" (2025)
• number of slots: 5
• compatible filters: 2" (50.4 mm) and 50 mm unmounted
• optical thickness: 20 mm
• weight: 540 g
• power: 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: enhanced sealing + enclosed motor housing
• software compatibility: ASIAIR / ASIStudio / ASCOM / ZWO SDK
• drivers required: none (plug-and-play)