kfconcept
Please note: our M42 adapter ring could not be suitable for Pentax Takumar Super Takumar Carl Zeiss M42 series(aperture pin does not fully depress, small tabs sticking out), as ours depresses the aperture pin all the way down
If your camera indicated "lens is not properly installed", please modify the camera menu settings. Usually called the "release the shutter the lens is not installed", you can modify the settings to allow. Specifically refer to the camera manual.Following are some examples:
Pentax Q Lens Adapter Pentax K To Q Adapter Pentax Lens Adapter For Canon Lens Adapter For Pentax Pentax Q Adapter K Canon Lens Pentax Adapter Asahi Pentax Lens Adapter Pentax K-1 Lens Adapter Pentax Lens To Lens Adapter Sony E-mount Street Style Lens
Helios 44-2 Canon Adapter Nikon Coolpix L340 Lens Adapter Nikon D5200 Wireless Mobile Adapter Nikon Z6 + Adapter Blackmagic 4k Canon Adapter Lens Filter Adapter Fa-dc58c Nikon Lens Adapter For A6500 Rokinon Camera Lens 16mm Ef Mount T2.2 Best Nikon Mount Lenses Sony Ericsson Elm Headphone Adapter