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ZWO Made progress on narrowband filters with the new standard
those produced by artificial light including mercury vapor
Enjoy the Beauty of the Night Sky Anywhere
of course what matters the most is how well they perform in their intended use
M42-M42 Extender 183MM ZWO Made progress on narrowbandAttached with the ASI071MC C. The extender is designed to help you to reach 55mm or any other back focus distance. In this example the aim is to reach 55mm with an OAG: attach the 21mm extender to ASI071 to reach 55mm back focus distance: 17. 5mm+21mm+16. 5mm=55mm
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