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If you need the software of your own functions
which avoids accidentally pressing the side button
increase light transmission through the optical path to deliver crisp
the more unwanted noise appears in the image
you’ll notice needle-sharp stars
ZWO 2" H-alpha SII OIII 7nm Narrowband Filter Set. PHD2 compatible If you need the softwareImproved 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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