Specification: Item Type: C Mount Lens Material: Alloy Purpose: Suitable for VGA USB industrial video microscope camera for electronic inspection, jewelry inspection, LCD, crystal inspection, etc. Working Distance: Approx. 125mm or 4.9in Zoom C Mount Lens: 0.5x C Mount Adapter Zoom Ratio: 6.5:1 Objective Lens Magnification Power: 0.7-4.5X (approximately 10-180X on a 22in monitor) Maximum Multiple Field of View: Approx. 2.8x1.5mm or 0.11x0.06in Minimum Multiples Field of View: Approx. 25x14mm or 0.98x0.55in Lens Length: Approx. 168mm or 6.6in Lens Diameter: Approx. 50mm or 2.0in Package List: 1 x C Mount Lens Note: 1. The bottom of the lens is factory adjusted to fix the lens with exposed glue, which is normal. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.