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the more unwanted noise appears in the image
94% transmission at 656nm (H-alpha)
Fast polar alignment routine
you’ll notice needle-sharp stars
ZWO 2" H-alpha SII OIII 7nm Narrowband Filter Set. PHD2 compatible the more unwanted noise appearsImproved 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
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