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Amazon.com : Large Aperture Lens, 50mm F1.7 Large Aperture Standard Focusing Silent Frame Lens, Black Optical Glass Camera Manual Lens, for M42 Mounting SLR Camera : Electronics
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Best 50mm to 60mm M42 lenses - for portraits, landscapes, bokeh, walking around town, macro etc - YouTube
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Amazon.com : Industar 50-2 50mm F3.5 Russian Lens for M42 Mount Cameras for Micro 4/3 Olympus Pentax : Electronics
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Best 50mm to 60mm M42 lenses - for portraits, landscapes, bokeh, walking around town, macro etc - YouTube
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