Attached with the ASI071MC-C.
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
ZWO M42-M42 extender (21mm length )
| Article number: | ZWO T2-EXT-21 |
| Availability: | In stock |
| Delivery time: | In Stock! |