Arducam CS-Mount Lens for Raspberry Pi HQ Camera, 8mm Focal Length with Manual Focus and Adjustable Aperture
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Focal length - Wikipedia
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Amazon.com: Adjustable Focal Length Industrial 8-50mm C-Mount Zoom Lens for Raspberry Pi HQ Camera, Flexible Zoom in/Out Angle of View for Pi 4 3 B B+ Zero @XYGStudy : Electronics