Oppo shows off its next-generation optical zoom camera module with 85-135mm equivalent focal length: Digital Photography Review
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Figure 1-38.Variable focal-length (zoom) lens
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Amazon.com: High Power 60X HD Telephoto Lens 650‑700mm Focal Length External Zoom Lens with Phone Tripod for Smartphone Lens Attachment : Cell Phones & Accessories
Focal Length | Understanding Camera Zoom & Lens Focal Length | Nikon | Nikon
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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
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