nikon 200mm f2 減焦 F1.2 ?

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peter:
200mm f/2.0 lens used afocally with 45mm Celestron Plossl and NVD Micro to provide a TFOV of 7 degrees at f/1.2

https://www.cloudynights.com/gallery/image/133410-pxl-20211013-220116332/

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