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USB Rifle Borescope Size Chart

Side-view Mirrors
Outer Diameter Caliber Depth of Field of the camera with the side-view mirror
0.2-inch (5mm)  0.20-inch(5mm) Caliber and larger With lock ring: 0-inch to 0.28-inch (0mm to 7mm)
Without lock ring:0-inch to 0.39-inch (0mm to 10mm)
0.28-inch (7mm)  0.28-inch(7mm) Caliber and larger With lock ring: 0-inch to 0.08-inch (0mm to 2mm)
Without lock ring:0-inch to 0.16-inch (0mm to 4mm)
0.33-inch (8.3mm)  0.33-inch(8.3mm) Caliber and larger With lock ring: 0-inch to 0.08-inch (0mm to 2mm)
Without lock ring:0-inch to 0.14-inch (0mm to 3.5mm)
0.47-inch (12mm)  0.47-inch(12mm) Caliber and larger With lock ring: 0-inch to 0.06-inch (0mm to 1.5mm)
Without lock ring:0-inch to 0.12-inch (0mm to 3mm)

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