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:
Contax 645 To Pentax 645 Adapter Mamiya 645 To Pentax 645 Adapter Pentax 645 Hasselblad Adapter Pentax 67 To 645 Adapter Pentax 645 A Mount Pentax 645 Adapter K Pentax 67 Adapter 645 Pentax 645 Canon Adapter Pentax 645 To Canon Adapter Minolta Xg-a Lens Mount
Green L Cpl Lens Filter Sigma 35mm Canon Mount Nikon To Mft Adapter Autofocus 43x Wide Angle Lens Adapter Century Tele-athenar 300mm F4.5 Lens C Mount Identifying Dslr Lens Mounts Kiron Ef Mft Adapter T2 Adapter Nikon D3200 Fd Mount For Nikon Sony A7 Iii Nikon Mount