For screw fasteners — M52×0,75. Limits of the opening scale: 1:2-1:16. Correctly process the selection of the adapter in order for the diaphragm to work in manual mode, you need an adapter with a "shelf" to press the diaphragm pusher.
KMZ MC HELIOS 44m-4 58mm / f2 Soviet lens M42, Silver Bokeh portrait lens ????????
MC Helios 44m-6 58mm f2 Lens M42 Mount #9291161 + Front Cap
[MINT] Russia Helios 44M 58mm f/2 Manual Portrait Lens For M42 Mount from JAPAN
Rare [Near MINT++] Zenit Helios 40-2-N 85mm f/1.5 Lens for Nikon Mount JAPAN
Near Mint MC Cosmicar Zoom 28-80mm F/3.5-4.5 Macro a.k.a SMC Pentax a Lens /JP
[N MINT] MC FLEKTOGON Carl Zeiss JENA DDR 35mm 2.4 Lens M42 Extension From JAPAN
![[MINT] Russia Helios 44M 58mm f/2 Manual Portrait Lens For M42 Mount from JAPAN](https://images.buynet.work/thumb.php?i=401417692&s=240)
![Rare [Near MINT++] Zenit Helios 40-2-N 85mm f/1.5 Lens for Nikon Mount JAPAN](https://images.buynet.work/thumb.php?i=401837096&s=240)
![[N MINT] MC FLEKTOGON Carl Zeiss JENA DDR 35mm 2.4 Lens M42 Extension From JAPAN](https://images.buynet.work/thumb.php?i=399233634&s=240)