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Asahi Pentax Takumar 83mm F/1.9 Lens for M37 Mount w/ M42 Adapter from Japan (C1749) | Big Fish J-Camera (Big Fish J-Shop)
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M37-M42 M37 x 0.75 Female to 42mm x 1 Male Screw Camera Lens adapter - AliExpress Consumer Electronics
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M37-m42 Transfer Ring M370.75 Mm Transfer Ring M42(1) Modified Mouth Ring Whole Tooth Transfer 37-42mm Adapter Ring - Lens Adapter - AliExpress
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Tele-photo Takumar 135mm F3.5 Reviews - M37 Screwmount Prime Lenses - Pentax Lens Reviews & Lens Database
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For Sale - Sold Genuine vintage Asahi Pentax M37-M42 converter ring with original box - PentaxForums.com
![Asahi Pentax Takumar 83mm F/1.9 Lens for M37 Mount w/ M42 Adapter from Japan (C1749) | Big Fish J-Camera (Big Fish J-Shop) Asahi Pentax Takumar 83mm F/1.9 Lens for M37 Mount w/ M42 Adapter from Japan (C1749) | Big Fish J-Camera (Big Fish J-Shop)](https://jshop.jp/cameratest/pic/C1749_S01.jpg)