![Amazon.com : Adjustable Iris Aperture Diaphragm M30 to M37 Iris Aperture Diaphragm Adapter Optical Diaphragm 1.5-26mm Lens Module Adapter Ring PVS-14 PSV14 Optics : Electronics Amazon.com : Adjustable Iris Aperture Diaphragm M30 to M37 Iris Aperture Diaphragm Adapter Optical Diaphragm 1.5-26mm Lens Module Adapter Ring PVS-14 PSV14 Optics : Electronics](https://m.media-amazon.com/images/I/61cq3V0erWL._AC_UF350,350_QL80_.jpg)
Amazon.com : Adjustable Iris Aperture Diaphragm M30 to M37 Iris Aperture Diaphragm Adapter Optical Diaphragm 1.5-26mm Lens Module Adapter Ring PVS-14 PSV14 Optics : Electronics
![Adjustable Aperture 1.5-26mm Iris Diaphragm M30 to M37 Camera Lens Module DIY Retrofit Adapter Ring - AliExpress Adjustable Aperture 1.5-26mm Iris Diaphragm M30 to M37 Camera Lens Module DIY Retrofit Adapter Ring - AliExpress](https://ae01.alicdn.com/kf/Sae5c74c5859244ada3b3e3a2639515f9B/Adjustable-Aperture-1-5-26mm-Iris-Diaphragm-M30-to-M37-Camera-Lens-Module-DIY-Retrofit-Adapter.jpg)
Adjustable Aperture 1.5-26mm Iris Diaphragm M30 to M37 Camera Lens Module DIY Retrofit Adapter Ring - AliExpress
![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)
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)
![Adjustable Iris Diaphragm Aperture Module Camera Lens Adapter 1.5-29mm M30 to M37 M42 to M42 Camera Lens Module Adapter Ring - AliExpress Adjustable Iris Diaphragm Aperture Module Camera Lens Adapter 1.5-29mm M30 to M37 M42 to M42 Camera Lens Module Adapter Ring - AliExpress](https://ae01.alicdn.com/kf/S07116b8041cd453095c6b2301c34078df/Adjustable-Iris-Diaphragm-Aperture-Module-Camera-Lens-Adapter-1-5-29mm-M30-to-M37-M42-to.jpg)
Adjustable Iris Diaphragm Aperture Module Camera Lens Adapter 1.5-29mm M30 to M37 M42 to M42 Camera Lens Module Adapter Ring - AliExpress
![Adjustable Aperture 1.5-26mm Iris Diaphragm M30 to M37 Camera Lens Module DIY Retrofit Adapter Ring - AliExpress Adjustable Aperture 1.5-26mm Iris Diaphragm M30 to M37 Camera Lens Module DIY Retrofit Adapter Ring - AliExpress](https://ae01.alicdn.com/kf/S7de888bb1b8c4c7dbdf031f8da0d6730W/Adjustable-Aperture-1-5-26mm-Iris-Diaphragm-M30-to-M37-Camera-Lens-Module-DIY-Retrofit-Adapter.jpg)
Adjustable Aperture 1.5-26mm Iris Diaphragm M30 to M37 Camera Lens Module DIY Retrofit Adapter Ring - AliExpress
![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_04.jpg)
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)
![High Quality Adapter Ring M37-M42 full tooth ring M37 * 0.75 M42 * 1 internal thread M37 M42 external thread M42 High Quality Adapter Ring M37-M42 full tooth ring M37 * 0.75 M42 * 1 internal thread M37 M42 external thread M42](https://ae01.alicdn.com/kf/Sed96c36795534fa280ce125921ad628eS.jpg_640x640Q90.jpg_.webp)
High Quality Adapter Ring M37-M42 full tooth ring M37 * 0.75 M42 * 1 internal thread M37 M42 external thread M42
![Iris Diaphragm M30 to M37 Aperture Night Vision Scope Objective Lens Module Camera Retrofit Adapter Ring 1.5-26mm Adjustable - AliExpress Iris Diaphragm M30 to M37 Aperture Night Vision Scope Objective Lens Module Camera Retrofit Adapter Ring 1.5-26mm Adjustable - AliExpress](https://ae01.alicdn.com/kf/S93a4d3384344467499ab02f23569f9d3M.jpg_640x640Q90.jpg_.webp)
Iris Diaphragm M30 to M37 Aperture Night Vision Scope Objective Lens Module Camera Retrofit Adapter Ring 1.5-26mm Adjustable - AliExpress
![Tele-photo Takumar 135mm F3.5 Reviews - M37 Screwmount Prime Lenses - Pentax Lens Reviews & Lens Database Tele-photo Takumar 135mm F3.5 Reviews - M37 Screwmount Prime Lenses - Pentax Lens Reviews & Lens Database](https://www.pentaxforums.com/forums/members/37111--a-t-/albums/11638-tele-tak-135-f3-5-lens-review/picture107457.jpg)