Discovery Astrophotography with ZWO ASTRO
M42-M42 Extender
$18.00
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Description
Attached 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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