_focal-length-vs-focal-ratio-what-they-do-conceptually-astronomy-science-telescope-preview-1.jpg "Focal Length vs. Focal Ratio: What They Do Conceptually! #astronomy #science #telescope from definition of focus in astronomy Video Screenshot Preview 1")
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Gallery_focal-length-vs-focal-ratio-what-they-do-conceptually-astronomy-science-telescope-preview-hqdefault.jpg "Focal Length vs. Focal Ratio: What They Do Conceptually! #astronomy #science #telescope from definition of focus in astronomy Video Screenshot Preview hqdefault")
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