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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:
Eyepiece Adapter For Camera Lens Lens To Eyepiece Adapters Canon Ef Lens Mount Diameter Canon Fd Lens Eyepiece Adapter Camera Lens Eyepiece Adapter Lens To Eyepiece Adapter Nikon Lens Eyepiece Adapter Rifle Scope Eyepiece Lens Adapter Telephoto Lens Eyepiece Adapter Eyepiece Adapter For Nikon
Canon Ef Mount Diameter 150-600 Sony E Mount Canon 18 108mm C Mount S16 Lens Canon Flash 90 Degree Angle Adapter Industar Lens Adapters For T6i Eos 1100d Lens Mount Iphone 14 Pro Lens Mount Angenieux 12-120 To Nikon Mount Adapter Promaster Pentax K Adapter Best Af Adapters For Sony E