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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:
Sigma X Mount Lens Pentax 6x7 Panoramic Adapter Pentax 6x7 Adapter Canon Pentax 6x7 Lens Adapter Pentax 645 Adapter 6x7 Pentax 6x7 35mm Adapter Pentax 6x7 Adapter K Pentax 6x7 Pk Adapter Pentax 6x7 To Gfx Adapter Pentax 6x7 To M42 Adapter
Canon Xs Fd Mount Canon T Ring Adapter Canon Usa Pentax Zx-10 Lens Mount Sony E Mount Lens Wiki Nikon M-223 Mount 833 Nikon P Series Mounts Sony Player Adapter For Wireless Sony Sa D10 Adapter Price Wireless Speaker Adapter For Sony Home Theater Sony E Mount 24-70 Equivalent