Dahua PFL0550-E6D 6MP 5 mm to 50 mm Vari-focal Lens
Best Varifocal Lenses for Glasses - Oldfields Opticians
Computar 3.5-8mm Varifocal Lens | eBay
Samsung 1/3" 5-50mm 1:1.7 f1.7 CS Mount Varifocal Lens - F/S from USA | eBay
CCTV 2.8-12mm Varifocal Lens Full Hd 1080P CMOS OV2710 30fps/60fps/120fps Industrial Usb Camera UVC for Android ,Linux, Windows - AliExpress
What makes bifocals glasses cheaper than varifocal?
Varifocal Glasses Explained - [2023 UPDATED]
Amazon.com: Hotpet 8 Megapixel USB Camera 2.8-12mm Varifocal Lens Webcam HD 3264X2448 Web Camera with Sony IMX179 Image Sensor Mini Industrial Camera Outdoor Indoor Web Cams Plug&Play, Support UVC OTG 2.0 : Electronics
High Quality 5-50mm 6-60mm 2.8-12mm Megapixel Varifocal Lens Manual Zoom & Focus CS Mount CCTV Lens for CCTV Security Camera - AliExpress