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Optical Glass Lens, 3" (75mm) - 200mm Focal Length - Ground, Beveled Edges - Use as Top Spinning Base - Eisco Labs: Science Classroom Optics Kits: Amazon.com: Industrial & Scientific
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Samyang Launches the New AF 75mm f/1.8 FE Portrait Lens for Sony E Full-Frame Mirrorless Cameras - Exibart Street
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Amazon.com : Ricoh Teleconversion Lens GT-2 [Compatible with RICOH GR IIIx] [1.5X teleconversion Lens] [Achieves Focal Length Equivalent to 75mm When cropping 50mm] [Used with Lens Adapter GA-2 (Sold Separately)] : Electronics
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