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Amazon.com : HSL Reflector Telescope,76mm Aperture 700mm Focal Length Astronomy Reflector Telescopes (35X-875X) for Adults and Kids-with 3 Eyepieces,5X Barlow Lens,Moon Filter and Smartphone Adapter : Electronics
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Practical measurement of cell-phone camera lens focal length
Understanding Focal Length On Smartphone Cameras | The Smartphone Photographer
Pinhole camera model and camera rotation procedure. (A) The smartphone... | Download Scientific Diagram
Practical measurement of cell-phone camera lens focal length