Brand Name:;ZWO Model Number:EFW 8x1.25 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 manufactor for the stepmotor and the quality is trustful and reliable. long life. We have two;specifications: TYPE1: 8 positions, 1.25 or 31mm filter can be used. TYPE2: 7 positions, 36mm filter can be used. The Electronic Filter wheel can be rotated in both counter clockwise 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. What`s in the box 8x31mm or 7x36mm EFW body 1.25 cover T2 nosepiece 1.25 holder(with cover and 2 screws) T2T2 adapter(male) A bag of spacers USB2.0 2m cable Phillips screwdriver A bag of M2 screws; ;