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:
Reverse Lens Adapter Canon Novoflex Reverse Lens Adapter Reverse Lens Adapter Nikon Pentax 67 Reverse Adapter Lens Reverse Adapter Ring Eos Reverse Lens Adapter Reverse Lens Adapter For Pentax Camera Aputure Dec Wireless Remote Adapter Nikon Pentax 645 Reverse Adapter Pentax Q Reverse Adapter
Best Lens Filter For Water Gopro 5 Red Filter Lens Sony E Mount Compact Lens Fujifilm Xt20 Lens Adapter Cameras With Leica M Mount Nikon Fc Mount Adapter Nikon T Mount For Red Cat Irix 15mm Sony Mount Sony A7r M Mount Sony E-mount Pz 18-200mm