ZWO 2" H-alpha SII OIII 7nm Narrowband Filter Set. PHD2 compatible Dual-speed Rack & Pinion Focuser

Dual-speed Rack & Pinion Focuser

Fast polar alignment routine

as the balance and position of stars and gas will leave something that will look completely different

which avoids accidentally pressing the side button

ZWO 2" H-alpha SII OIII 7nm Narrowband Filter Set. PHD2 compatible Dual-speed Rack & Pinion FocuserImproved ZWO Narrowband Filters Since mid 2018, ZWO has supplied an improved version of their narrowband filters. The improvement is most noticeable when imaging night sky landscapes containing very bright stars, particularly with the H alpha and SII filters. With the updated OIII filters, the difference is more subtle. Production of the 2" version began at the end of 2019 and it has only ever been available in this improved form. For this reason, ZWO