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:
Cheap Leica M Mount Lenses Pentax Q Lens Adapter Pentax K1 Lens Mount Pentax K To Q Adapter Lens Adapter For Pentax Pentax Q Adapter K Pentax K-1 Lens Adapter Pentax Lens To Lens Adapter Pentax K1 K Mount Lens M42 Adapter Pentax K1
Carl Zeiss Nikon F Mount Zwo To Canon Adapter 35mm Lens Adapter For Dslr 20-60mm F3.5-5.6 L Mount Lens G Master E Mount Lens Nikon F401 Lens Mount Pentax Dslr Lens Mount Nikon F Mount Mount Rear Lense Mount Vivitar 28mm 2.5 Nikon Mount Sony 70-300 A Mount With La-ea3