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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 Sony Mavica Floppy Adapter Pentax K-1 Lens Adapter Pentax Lens To Lens Adapter Zeiss Cp.3 35mm T2.1 E Mount Lens Zeiss Cp.3 Lens Inforamtion Ef Mount
Canon At-1 Lens Mount Canon Eos M100 Lens Mount Is Canon 60d Mount Ef Moondog Moment Lens Adapter Best K Mount Prime Lens C Mount Lens Nz Minolta Xd7 Lens Mount Nikon Dk-18 Eyepiece Adapter Set Nikon To E Mount Adapters Nikon C Mount Camera