ZWO 2" H-alpha SII OIII 7nm Narrowband Filter Set. Sony IMX224 it provides smooth

it provides smooth

Dark frames help reduce sensor noise

Are completely new to astrophotography

high-quality optical glass

Advanced Port Protections: The UPBv3 features sophisticated short circuit and per-port overload protections

ZWO 2" H-alpha SII OIII 7nm Narrowband Filter Set. Sony IMX224 it provides smoothImproved 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