Be Unique - Lensbaby Obscura Hands-On Review - YouTube
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Easily create a camera obscura - AlternativePhotography.com
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While Not Quite a Camera Obscura, This Obscure Camera Has Captured Our Interest! - Hackster.io
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File:Camera obscura mirror and lens.jpg - Wikimedia Commons
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Lenses. 3 camera obscura / pinhole camera 3 Focal length is the distance between the lens and the point where the light rays converge. It controls. - ppt download