ZWO M42-M42 Extender 21mm Length for Astrophotography

ZWO M42-M42 extender (21mm length )

It can help you to reach 55mm back focus distance for example:

attach the 21mm extender to ASI071 to reach 55mm back focus distance:

17.5mm+21mm+16.5mm=55mm

Product 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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