Airy Disk 0.75x Flat-Field Adapter for Astrophotography

Description

3 element – 0.75x-Flat Field for sharper stars all to way to the edge.  Specifically made for the 106mm APO. Screws on to the M63x1-Thread. 0.75x factor – reduces the focal length to 525mm while giving f/4.95.  55 mm to 60 mm back distance – fine tune in 0.05 mm Increments – from the M48x0.75-thread.

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