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:
Canon Mount Adapter With Nd Filter Rolleiflex To Leica Lens Adapter For M3 Rolleiflex Sl66 Lens Adapter Rolleiflex 6000 Lens Mount Rolleiflex Sl20000 F Lens Mount Rolleiflex Sl20000 Lens Mount Rolleiflex Sl35 E Lens Mount Rolleiflex Sl35 Lens Mount Rolleiflex Sl35e Lens Mount Rolleiflex Sl66 Lens Mount
Whirlpool Rh4730xdb2 Light Lens And Filter Bj's Optical Blue Filter Lens Solar Filter Universal Lens Filter 50mm Sony Wf-1000xm4 Airplane Adapter C Mount Lens Focal Length Sony A7rii E Mount Lens Nikon Coolpix Slide Adapter Nikon P 223 Mount Nikon V1 C Mount 70-200 F1.8 Sony E Mount