Professional Optical Equipment

ZWO EFW Electronic Filter Wheel for 7 x 2″ filters. With this EFW, you can change filters electronically via USB. Also suitable for unmounted 50 mm filters.

• The filter wheel body is CNC milled from an aircraft graded aluminum block.
• Excellent craftsmanship, very thin and lightweight with only 20mm thickness.
• The core part of ZWO’s EFW is the stepper motor which has reliable performance and quality that comes from NPM, Japan.
• There is no need of multiple cables to power this wheel up, just one USB cable does the trick.The maximum power supply of this EFW is approximately 120mAh @ 5V, which can be operated from the Cooled CCD’s USB2.0 port.

Since 2023, ZWO included a filter darkening mask set for EFW 7×2″.

Specifications of the darkening sets(4pcs):
External diameter: 88mm. Inner diameter: 55mm (2pcs) & 58mm (2pcs). Thickness: ≤0.2. 4pcs in total.

ZWO EFW Electronic Filter Wheel for 5 x 2″ filters. With this EFW, you can change filters electronically via USB. 

• The filter wheel body is CNC milled from an aircraft graded aluminum block.
• Excellent craftsmanship, very thin and lightweight with only 20mm thickness.
• The core part of ZWO’s EFW is the stepper motor which has reliable performance and quality that comes from NPM, Japan.
• There is no need of multiple cables to power this wheel up, just one USB cable does the trick.The maximum power supply of this EFW is approximately 120mAh @ 5V, which can be operated from the Cooled CCD’s USB2.0 port.

Since 2023, ZWO included a filter darkening mask set for EFW 5×2″. 

Specifications of the darkening sets(4pcs):
External diameter: 88mm. Inner diameter: 55mm (2pcs) & 58mm (2pcs). Thickness: ≤0.2. 4pcs in total.

ZWO EFW Electronic Filter Wheel for 8 x 1.25″ filters. With this EFW, you can change filters electronically via USB.

• The filter wheel body is CNC milled from an aircraft graded aluminum block.
• Excellent craftsmanship, very thin and lightweight with only 20mm thickness.
• The core part of ZWO’s EFW is the stepper motor which has reliable performance and quality that comes from NPM, Japan.
• There is no need of multiple cables to power this wheel up, just one USB cable does the trick.The maximum power supply of this EFW is approximately 120mAh @ 5V, which can be operated from the Cooled CCD’s USB2.0 port.

The smallest and most lightweight 1.25″ Electronic Filter Wheel in the world! The body is CNC machined from a full block of aircraft grade aluminium.

• Supports both 5*1.25″ filters or 5*31mm filters
• Very thin design, thickness only 20mm 
• Weight only 300g
• The step motor is the heart of the EFWmini, which is made by NPM from Japan. You can trust its quality and relability.
• The Electronic Filter wheel can be rotated in both counterclockwise or clockwise direction for filter selection.
• Only one USB Cable is enough to power up the EFW, the max power consumption is around 120ma@5V, so you can connected it form the USB2.0 hub of our cooled cameras.
• The distance between the filter and sensor is around 10mm when you connect it to ASI1600.