kfconcept
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:
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Short Throw Lens Adapter Zeiss Milvus Sony E Mount Sigma 18-35 Sony A Mount Canon Ef M Mount Specs Canon Efs Ef M Adapter 62mm Lens Adapter Tube Camera Lens Adapters 2x 58mm Lens Filter Adapter 52-62 Lente Sony E Mount 35mm Sony E Mount 59mm