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Google Cardboard, 3D VR Headsets DIY Virtual Reality box Glasses with Clear Optical Lens and Comfortable Head Strap for All 4-6 Inch Smartphones (VR2.0 Yellow, 1Pack) : Amazon.co.uk: Electronics & Photo
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Google Cardboard, 3D VR Headsets DIY Virtual Reality box Glasses with Clear Optical Lens and Comfortable Head Strap for All 4-6 Inch Smartphones (VR F Starter Diy, 2Pack) : Amazon.co.uk: Electronics &
What are the lens dimensions for Google Cardboard? Does it need to be biconvex? Is 40mm (25 optic power) the best focal length? What should be its size/diameter? - Quora
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Making a VR (Google Cardboard) Headset with almost any kind of magnifying glass | by Lakshya A Agrawal | Medium
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Amazon.com: Biconvex Lens Set, Pop-Tech Optical Glass Lens Bi-Convex 34mm Diameter 45mm Focal Length Lenses for Google Cardboard VR : Electronics
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