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Thread: outer M42*0
The best solution of 55mm back focus length
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M42-M42 Extender 183MM Thread: outer M42*0Attached 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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