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Pentax 17mm f/4 Fish-eye-Takumar Manual Focus Lens for M42 Screw Mount {Built-In Filters: Y48(Y2), L39(UV), 056(02)} at KEH Camera
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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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M42 Series Lens to M4/3 Series Mount Camera, M42-M4/3 IV PRO High Precision Lens Mount Adapter - KENTFAITH
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