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Amazon.com : Fotasy 35-90mm M42 to M42 Lens Macro Helicoid Adapter, 42mm Focusing Helicoid Extention Tube, 35mm to 90mm, 55mm Max Movement, fits M42 Screw Mount Lens : Digital Camera Screen Protector
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Helios 44M 58mm F2 Russian Lens M42 mount : Electronics - Amazon.com
Amazon.com : SVBONY SV109 24-35mm M42 Variable Extension Tube T2-Extension Length for Astrophotography : Electronics
