How many wavelengths does the infrared filter have?

The wavelength range of infrared ray. Not because of the wavelength of the infrared filter! There is no wavelength in the filter! The concept is different.

Infrared perspective filter is a kind of photographic equipment that most photographers like very much, and it is also a sharp weapon in some special industries. For example, the public security department uses it to record criminal traces that are difficult to see with the naked eye, the scientific research department uses it to record the isolation experiment process, and the cultural relics protection department uses it to identify cultural relics. We can also use infrared photography technology to shoot scenes invisible to the naked eye in a dark and dreary environment; You can also use infrared filters to identify documents that have been tampered with, forged or burned. In landscape photography, infrared filters can also filter out the influence of atmospheric fog, making the distant scenery unexpectedly clear.

A photographer from a photography company told reporters that perspective photography is actually infrared photography. Infrared rays can be used to shoot things that are invisible to the naked eye, especially when it is dark at night. However, not all clothes can be seen through: pure cotton, wool and silk fabrics are relatively safe and cannot be seen through infrared rays. Nylon and blended clothes can achieve perspective effect, especially in swimming pools and other places, wet clothes are more clear. He particularly emphasized that Lycra is the fabric with the best perspective effect. Using the perspective function of infrared rays, some objects covered by some objects can be photographed. For example, you can take images of objects under the sand through thin sand. Alter documents by ink, photography, etc. These are all used by public security criminal investigation and troops.

Infrared photography is a relatively different shooting method. It is different from the traditional black-and-white color photos, and uses infrared sensitive equipment and infrared filters. The photos taken are so shocking that people can't put it down. At the same time, compared with visible light, infrared rays can penetrate some materials and clothes (fine chemical fiber, smoke, water vapor, etc.). ) and can produce magical perspective effect. These characteristics are widely used in military, public security, archaeology, medicine and other fields.

With the popularity of digital DC/DV in recent years, especially after Sony introduced the infrared night vision model, people became interested in infrared and its photography, because CMOS/CCD photosensitive elements used in digital cameras and camcorders can receive infrared wavelengths. Now we can take infrared photos and dynamic scenes only with infrared filters, and it is more convenient to understand and observe the strange infrared world in a WYSIWYG way.

Sony's flagship digital camera DSC-F707/DSC-F 717/DSC-F828 has built-in infrared night vision function.