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Self-centering Lens Holder / Adjustable Coaxial Circular Lens Mount / Variable Diameter Three-jaw Clamping Optical Holder - Air Conditioner Parts - AliExpress
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Item # 0002B-5410-10, Lens Savers® Windows - 27.9 x 5mm - Pack of 10 On International Crystal Laboratories
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0.5X Reduction Lens / Relay Lens Camera Coupler C-Mount Adapter, to Convert 25mm to Microscope Eyepiece Diameter 23.2mm 30mm 30.5mm | Boli Optics Microscope Store
Please help identify lens mount: Sony Alpha / NEX E-mount (APS-C) Talk Forum: Digital Photography Review
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