ZWO EFW 8 x 1.25"/31mm Filter Wheel

ZWO EFW 8 x 1.25-inch or 31mm turns a monochrome camera into a practical imaging system by automating filter changes. The right wheel depends on sensor size, filter size, back-focus budget, and how many channels you want loaded at once.

Choose filter diameter conservatively. Undersized filters vignette; oversized filters cost more but protect future camera upgrades.