Special purpose lenses

Micro lens: It is generally used in a shooting system with an imaging ratio greater than 10:1, but since the pixel size of the camera has been achieved within 3um, it is generally used when the imaging ratio is greater than 2:1.

Macro lens: Generally refers to the imaging ratio in the 1:4-2:1 range of specially designed lenses.

In the case of image quality requirements are not very high, generally can be used between the lens and the camera to add a close-up ring or in front of the lens to add a close-up mirror to achieve the effect of enlarged imaging。

Telecentric lens: mainly a lens specially designed to correct the parallax of the traditional lens, it can be within a certain distance range, so that the obtained image magnification does not change with the distance, which is very useful for the case that the measured object is not on the same surface.

Ultraviolet lens and Infrared lens: General lenses are designed for applications in the visible range, because the same optical system has different refractive indices for different wavelengths of light, resulting in different wavelengths of light emitted from the same point cannot converge into a point when imaging, resulting in color difference. The achromatic design of commonly used lenses is also for the visible range, while ultraviolet lenses and infrared lenses are specifically designed for ultraviolet and infrared lenses.