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optics - How wide does the front element of a lens have to be, given the focal length and the aperture? - Photography Stack Exchange
What Are F-Numbers on a Machine Vision Camera Lens?
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Formats and Focal Lengths
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Depth of Field
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LENSES: FOCAL LENGTH AND APERTURE – dimitriwaltersphotography.co.uk
Angular aperture - Wikipedia
Basics Part 1: Understanding Aperture, Focal Length and Focal Ratios – Blackwater Skies
Absolute and relative lens apertures
Focal Length | Understanding Camera Zoom & Lens Focal Length | Nikon | Nikon
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C-Mount Lens for Raspberry Pi High Quality Camera, 16mm Focal Length with Manual Focus and Aperture Adjustment
