ZWO EFW 8 x 1.25″/31mm Refractor Telescope This is just the beginning

This is just the beginning of an incredible journey of exploration possible with a Sky-Watcher 100/900 Evostar ED Doublet OTA

so that the Periodic Error inherent to all worm gear driven mounts can be learned and permanently corrected for

Compatible filters 8 x 1

This becomes especially useful with ultra low focal plane (visual Newtonian) telescopes

4 arc-minutes (6356 Counts/Rev

ZWO EFW 8 x 1.25″/31mm Refractor Telescope This is just the beginningThe ZWO 8 x 1. 25" Electronic Filter Wheel weighs only 400 grams, is CNC machined and has an optical thickness of only 20mm. This model can take 8 x 1. 25 mounted or 31mm unmounted filters. The power absorption of the EFW is only 120mAh @ 5V so any USB cable can power it. The distance between the filter and sensor of the Pro cameras like the ASI533MM Pro is circa 10mm. This close distance prevents any vignetting with 1. 25 filters for telescopes up to