ZWO EFW 7x36II Electronic Filter Wheel – Precision at Your Fingertips

When it comes to deep-sky imaging, precision and efficiency are everything. The ZWO EFW 7x36II electronic filter wheel is designed for astrophotographers who demand the best in automated filter control. Whether you’re capturing stunning nebulae in narrowband or assembling rich, true-color images with LRGB, this upgraded 7-position filter wheel makes swapping filters seamless and reliable.

Refined and Improved Design

ZWO’s second-generation EFW 7x36II builds upon the success of its predecessor, featuring a thinner and lighter body without sacrificing durability. The CNC-machined aluminum construction ensures long-term reliability while keeping weight to a minimum—ideal for setups where every ounce counts. At only 20mm thick, this filter wheel integrates easily into your imaging train without adding excessive backfocus, making it a perfect companion for ZWO’s full-frame and APS-C cameras.

Effortless Electronic Operation

Manual filter swaps are a thing of the past. The ZWO EFW 7x36II connects directly to your imaging software, allowing you to cycle through seven 36mm unmounted filters with just a click. The high-quality stepper motor provides smooth, accurate positioning, ensuring that your selected filter is precisely where it needs to be every time. This means fewer alignment issues, greater repeatability, and a hassle-free imaging session.

Optimized for Performance

• Fast and Quiet Rotation – The EFW 7x36II uses an advanced stepper motor for ultra-quiet operation. You’ll barely notice the movement, but you’ll appreciate the speed and accuracy.
• Minimal Power Consumption – The filter wheel runs directly from your camera’s USB port or an external power source, drawing only 120mAh at 5V—no need for bulky power supplies.
• Secure Filter Mounting – Designed to accommodate seven 36mm unmounted filters, this wheel is perfect for LRGB + Ha, OIII, SII, and even specialty filters like UV/IR cut or methane filters.

Seamless Integration with ZWO Cameras

Designed specifically for ZWO’s ASI series cameras, the EFW 7x36II works flawlessly with popular astrophotography software, including ASCOM drivers and native support in ZWO’s ASI Studio, NINA, and Sequence Generator Pro. The included USB 2.0 cable ensures a straightforward plug-and-play connection. No complex drivers, no fiddling—just smooth operation from the start.

Ideal for Advanced Astrophotography

If you’re using a monochrome camera, this filter wheel is an essential upgrade. Whether you’re stacking high-resolution LRGB images or capturing breathtaking Hubble-palette narrowband images, the ability to rapidly switch filters means less time wasted and more data captured. The 7-position design also gives you the flexibility to include additional specialty filters without constantly swapping them manually.

Specifications at a Glance

• Filter Slots: 7 (supports unmounted 36mm filters)
• Thickness: 20mm
• Weight: ~17.6 oz
• Motor: High-quality stepper motor
• Power Requirement: 5V, 120mAh (via USB)
• Software Compatibility: ASCOM, ZWO ASI Studio, NINA, SGP

The Bottom Line

The ZWO EFW 7x36II is a game-changer for deep-space imagers looking for seamless filter switching. Its lightweight yet durable build, ultra-precise stepper motor, and software compatibility make it a must-have for serious astrophotographers. Whether you’re capturing galaxies, nebulae, or planetary details, this filter wheel helps you focus on what really matters—getting the best possible images.

Upgrade your imaging setup today and experience the difference of a high-performance filter wheel.