New ZWO EFW 7x36mm Filter Wheel MKII

The new ZWO EFW 7x36mm Filter Wheel MKII was independently developed by ZWO for astronomical mono cameras. With the larger body and the newly-added screw holes on the covers, it will give a much easier and more fixable way to connect to ASI cameras.

There are 7 slots inside the EFW and we recommend you use the ZWO 36mm LRGB and SHO filter set with it.

The body of the  ZWO EFW 7x36mm Filter Wheel MKII CNC is  milled from an aircraft-graded aluminium block. It is made with high quality and thin with a thickness of only 20mm. The heart of the EFW uses quality step motors produced by NPM, Japan, which can be very trustworthy. When photographing, you can rotate the EFW in both counter clockwise or clockwise directions for filter selection. The whole operation process is rather convenient and efficient.

ZWO EFW 7x36mm Filter Wheel MKII Compared to the original 36mm EFW, you may find the new EFW has a bigger size. The screw holes on the front and back covers shall not only allow us directly connect the 36mm EFW to the camera and bring the filters closer to the camera sensor, also make the it possible to match it with M68 OAG.

ZWO EFW 7x36mm Filter Wheel MKII .There is no need for multiple cables to power this filter wheel up, just one USB cable does the trick. The power consumption of this EFW is approximately 120mAh @5V, which can be operated from the Cooled CMOS’s USB hub.

All ZWO 36mm filters can be perfectly supported by this EFW. But if you use filters from third party, then please make sure the thickness of the filter should be between 1.5mm and 3.0mm (the thickness of the filter frame is 1.8mm).

ZWO EFW 7x36mm Filter Wheel MKII - What’s in the box?

Specifications for the darkening sets(4pcs):

External diameter: 88mm. Inner diameter: 55mm (2pcs) & 58mm (2pcs). Thickness: ≤0.2. 4pcs in total.
* The reason for including the darkening sets is to help solve the light leaking issue occurring in the gap of the filter wheel and camera.

ZWO EFW 7x36mm Filter Wheel MKII How to install the darkening sets:

ZWO EFW 7x36mm Filter Wheel MKII Mechanical diagram

The best solution of 55mm back focus length

The latest connection methods for the new 36mm EFW and ASI cameras can be found here: 

If you are using ASI2600, then directly head over to this instruction: