Description
![](https://i.zwoastro.com/wp-content/uploads/2023/04/a209cea224394eb4d34a34ac41767e33-1024x853.jpg)
Attached with the ASI071MC-C.
![](https://i.zwoastro.com/wp-content/uploads/2023/04/5617dbe3b8959430d112eab5a78053e6-1024x853.jpg)
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
![](https://i.zwoastro.com/wp-content/uploads/2023/04/2ca3941abc7f36f461c5a082d8a02d9c.jpg)
![](https://i.zwoastro.com/wp-content/uploads/2023/04/f16548f0726f3c056468e1322688378d.jpg)
![](https://i.zwoastro.com/wp-content/uploads/2023/04/11405558da3f7c624cfcc02994b32c46.jpg)
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