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:
Focal Reducer Sony E Mount Canon Ef Mount Focal Reducer Canon Fd-x Mount Focal Reducer Focal Reducer Canon Mount Leica M Mount Focal Reducer Sony Focal Reducer For E Mount Lens Nikon Mount Fast Zoom Nikon To E Mount Focal Reducer Pentax K Mount Focal Reducer Pentax K Mount To M43 Focal Reducer
Runcam 2 With 35mm Ir-filter Lens Lens Filter For Nature Photography Filter Lens Or Gaussian Blur Canon R5 Lens Adapter Ef Lens On Efs Mount Sony Psvr Camera Adapter Best Canon Lens To Sonly Adaptoer Cosmicar 6mm F1.2 C-mount Lens Nikon 1 Pentax K Adapter Sony A7r Adapter Nikon