〖Urgent〗Do all digital camera lenses have infrared filters?

One of the most significant differences between digital cameras and film cameras is that digital photosensitive elements are very sensitive to infrared rays. In order to prevent infrared interference, digital cameras generally install a non-removable anti-infrared filter inside the lens. However, there are also some cameras whose anti-infrared filters can be adjusted by the user in order to achieve night vision or infrared photography functions. That is, the user can use the button or menu to choose to use or not use the anti-infrared filter. For example, the Sony 717 produced in 2001 is a very famous camera. At that time, Sony717's night vision function was widely rumored, and it was considered to be capable of infrared photography, that is, see-through clothing.

Since infrared rays are very weak compared to visible light, it is almost impossible to use a camera such as the Sony 717 for infrared photography during the day. Even if an infrared lens is installed, the effect is very poor.

Using an infrared emission tube at night may not necessarily produce good infrared photos, because many objects reflect very weak infrared rays. Or should we rely on the infrared rays emitted by the object itself to take photos to get beautiful and magical infrared photos. Fortunately, many objects have the ability to emit infrared rays.