Sandmarc iPhone Lens Review - A Fun Entry Into The World of High Quality Mobile Photography
Prices Canon compared with Nikon 500mm and 600mm telephoto lenses for sports and bird photography, but also useful for flowers high in rain forest trees (in Guatemala).
Amazon.com: SVPRO USB Webcam with Zoom Lens 5-50mm Manual Focus Webcam,8MP High Resolution Web Camera 3264x2448 USB Camera with Sony IMX179 Sensor,Mini HD Webcam UVC Computer Camera for Windows MAC Linux Android :
Arducam M12 Lens Kit for Raspberry Pi High Quality Camera, Fisheye Wide Angle Telephoto M12 Camera Lenses with Lens Adapter - Arducam
Adjustable wide angle lens (for Raspberry Pi High Quality Camera)