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 Lens Adapter For Pentax Pentax Q Adapter K Pentax K-1 Lens Adapter Pentax Lens To Lens Adapter Pentax K-01 Lens Mount Pentax Mirrorless K-01 Lens Mount Nikon Br 4 Adapter Ring Pentax 5-01 Ens Adapter
Sony E-mount 16-70mm F4 Zeiss Oss Adaptall 2 Sony E Mount Step-up Adapterring 72mm Lens To 77mm Viltrox Camera Lens Adapter Lights Cine Lens S Mount Sears Ksx Super Lens Mount Types Of Nikon F Mounts Pentax 110 Mount 18mm F2 8 Pentax Ist Ds Mount Sony Zs X3cp Adapter