The ZWO EFW-7x2 filter wheel offers precise electronic control of filter positioning during astronomical imaging. It’s ideal for use with large-sensor astronomy camera that require 2” filters. It accepts up to seven 2” threaded filters or 50.4mm +/- 0.5mm unmounted filters with a cell height that does not exceed 7mm and in which the male thread length does not exceed 3mm. (The initial ZWO specification of 5mm and 2.5mm, respectively, for this filter wheel was incorrect).

With a thickness of 20mm (0.79"), this filter wheel is made of black-anodized aircraft-grade aluminum and uses a whisper-quiet Japanese-made stepper motor to help ensure years of reliable field use. When used with a monochrome astronomy camera, this electronic filter wheel and a set of color or narrowband filters (not included) allow you to capture spectacular color images of astronomical objects. The ZWO 7-position EFW-7x2 filter wheel weighs just 650g (22.9oz) so it won't bog down your telescope mount. When connected to ZWO ASI6200 full-frame camera, the distance from the filter to the sensor is about 18mm.

The bi-directional electronic filter wheel is powered and controlled through the USB port on your camera or directly via a USB cable connected to your computer, so you don't need any extra power supplies to power the wheel. A USB2.0 cable is included. With ASCOM and SDK control modes, the wheel can be controlled with a wide range of standard astronomy and imaging software. The maximum power supply of this EFW is approximately 120mAh @ 5V which can be delivered from a cooled ZWO camera’s USB2.0 port (camera sold separately).

What's in the Box?

• EFW2*7 body
• USB2.0 – 2m cable
• A bag of M2.5*6 screws (6pcs/ bag)
• A bag of filter masks for 50mm filters (7pcs/ bag)
• Phillips screwdriver
• A bag of M2*4 flat screws (23pcs/ bag)
• M54M-M48F adapter
• M54M-M42F adapter