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URL: http://www.thaiexcite.com/ZWO-M42-M42-extender-21mm-.html

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ZWO M42-M42 extender (21mm)

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รายละเอียด

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Product Description

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