ZWO EFW 8 x 1.25″/31mm
Our latest EFW (Electronic Filter Wheel), larger than the previous but still low on weight. Only 400 grams (14 oz)!
 
The body is CNC milled from an aircraft-graded aluminum block.
We decided to make it thinner, where it measures only 20 mm on the wheel body.
 
The heart of our EFW comes from NPM, Japan, whose the manufacturer of the stepmotor, and the quality is trustworthy and reliable. Guaranteed long life.
 
The Electronic Filter wheel can be rotated in both counterclockwise or clockwise direction for filter selection.
 
There are no need for multiple cables to power this 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 CCD’s USB hub.
 
The distance between the filter and sensor is around 10mm when you connect it to ASI1600.
So 1.25″ filters won’t have vignetting up to F5 focal ratio scope and 31mm filter won’t have vignetting up to F2 lens.
 
Our new RGBL filters are recommended to work with ASI1600, it will offer nearly 1:1:1 RGB color balance.
 
 
 
New ZWO EFW 7x36mm
The new 36mm EFW (Electronic Filter Wheel) 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 is CNC milled from an aircraft-graded aluminum block. It is made with high quality and thin with a thickness of only 20mm. The heart of the EFW uses quality stepmotors produced by NPM, Japan, which can be very trustworthy. When photographing, you can rotate the EFW in both counterclockwise or clockwise directions for filter selection. The whole operation process is rather convenient and efficient.
 
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.
 
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 EFWmini (5 x 1.25″or 5 x 31mm)
The smallest and most lightweight 1.25″ Electronic Filter Wheel in the world!
300g ONLY! Small than your hand!
 
The body is CNC machined from a full block of aircraft-grade aluminum.
Very thin design, 20mm ONLY
 
Supports both 5*1.25″ filters or 5*31mm filters
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 connect it from the USB 2.0 hub of our cooled cameras.
 
The distance between the filter and sensor is around 10mm when you connect it to ASI1600.
So 1.25″ filters won’t have vignetting up to F5 focal ratio scope and 31mm filters won’t have vigentting up to F2 lens.
 
Our new RGBL filters are recommended to work with ASI1600, it will offer nearly 1:1:1 RGB color balance.
 
 
 
ZWO EFW (5 x 2″or 7 x 2″)
Product weight: EFW 5 x 2″=500g / EFW 7 x 2″=650g
Power supply: USB2.0
Control Mode: ASCOM and SDK
Driver: Free of driver
 
The filter wheel body is CNC milled from an aircraft graded aluminum block.
Excellent craftsmanship, very thin and light with only 20mm thickness.
The core part of our EFW is the stepper motor which has reliable performance and quality that comes from NPM, Japan.
We have two specifications for EFW2”:
TYPE1: EFW5X2”
TYPE2: EFW7X2”
 2″ Thread-In Filters or 50.4mm ±0.5mm Unmounted Filters can be used 
The 2” Electronic Filter Wheel can be rotated in both counter clockwise and clockwise direction for filter selection.
 
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.
When connected to ASI6200, the distance from the filter to the sensor is about 18mm
Our 2″ RGBL filters are recommended to work with ASI6200MM Pro camera, it will offer nearly 1:1:1 RGB color balance.
Below requirements must be met while using the 2” filter from third-party.
 
Filters (not including the threads) must be less than 7.5mm in thickness and less than 50.8mm in diameter. Threads must be less than 2.7mm in thickness.