Calibration device for a fixed focus lens

Abstract

The utility model provides a kind of calibration device for fixed focus lens. The calibration device for fixed focus lens includes: fixed focus lens;Variable diaphragm structure, variable diaphragm structure is located the outside of fixed focus lens and is connected with fixed focus lens, variable diaphragm structure is coaxially arranged with fixed focus lens, variable diaphragm structure includes cylinder and adjustable vane assembly, adjustable vane assembly is arranged in cylinder, the center of adjustable vane assembly has light hole, the diameter of light hole is adjustably set, and variable diaphragm structure is used to shorten the calibration distance of fixed focus lens. The utility model solves the problem that the calibration device for fixed focus lens in the prior art has a long calibration distance, resulting in a large overall size.

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