Teslong NTG100H 26in Rigid USB Borescope Black/Metallic Silver

Teslong NTG100H 26in Rigid USB Borescope Black/Metallic Silver. 18 in to 3.94 in (30 mm to 100 mm) Depth of Field of the camera WITH 0.2 in (5 mm) side-view mirror: With lock ring on: 0 in to 0.28 in (0 mm to 7 mm) Without lock ring: 0 in to 0.39 in (0 mm to 10 mm) Depth of Field of the camera WITH 0.28 in (7 mm) side-view mirror: With lock ring on: 0 in to 0.08 in (0 mm to 2mm) Without lock ring: 0 in to 0.16 in (0 mm to 4 mm) Depth of Field of the camera WITH 0.33 in (8.3 mm) side-view mirror: