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Tag Archives :APO

Know better about SA401 85mm APO spotting scope

As the summer is coming, the exploration, hunting, and bird watching become increasingly approaching!Now to better facilitate our explorers to process activities, we provide really the good assistant-SA401 20-60 85mm APO spotting scope. In the article, I introduce its strong points. Enjoy!  ...

Read more  SA401,  spotting scope,  spotter,  APO

Difference Between APO & Achromatic Lens Under Diffraction Ring

Test the APO and Achromatic, make sure the difference under diffraction ring, SV305 doublet is quality achromatic lens with SPL-51 ED glass.  ...

Read more  SV503 Doublet,  APO,  SPL-51,  Achromatic Lens