ZWO EFW 8 x 1.25″/31mm Refractor Telescope so that the Periodic Error

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

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

Autoguiding connection for astrophotography

25″ Super 25mm (48x)

axes with 9 slew speeds and 5 arcminute pointing precision

ZWO EFW 8 x 1.25″/31mm Refractor Telescope so that the Periodic ErrorThe 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