First, you need to tell the technicians what your lens application is, so that it will be helpful for the technicians to help you analyze the design indicators. Of course, some application designs involve commercial secrets, which is another matter.

The spectral range of the lens application, because the lens design needs to consider chromatic aberration, material and other characteristics, so you need to know the spectral range of the lens when it is used. That is to say, you are using monochromatic light, such as red light, green light, blue light, or white light full spectrum, or near infrared, short-wave infrared, medium-wave infrared, long-wave infrared light.

The focal length f of the lens, the field of view FOV, and the CCD sensor size. Why are these three technical indicators mentioned together? Because they have a conversion relationship: field of view = 2×arctan (CCD size/(2×focal length)) These concepts are easy to understand. The field of view is the field of view of the lens. The longer the focal length, the larger the target is magnified, and the smaller the field of view will be.

Aperture F/numerical aperture NA, the size of the aperture determines the amount of light entering the lens, and also affects the resolution of the lens. Generally, the greater the amount of light entering, the higher the brightness of the image plane. In low-brightness environments, a large aperture optical system should be used. Of course, the larger the aperture, the more difficult it is to design the lens, the more complex the lens is, and the cost will also increase. We should find a balance between usage requirements and costs.

Numerical aperture and aperture have the same function. Photographic objective lenses usually indicate the aperture size, while microscope lenses usually indicate the numerical aperture size. Note: The larger the aperture value, the smaller the aperture. For example, F1.4 is a large aperture lens, and F16 is a small aperture lens.

As a company specializing in optical products such as night vision devices, telescopes, thermal imaging, rangefinders, infrared cameras, speedometers, etc., Onick Optics will provide more convenient solutions for security and police use, search and rescue, emergency response, armed police firefighting, special rescue and other fields!