How to choose infrared photography filter?

The first thing to choose the wavelength of infrared filter depends on what machine is used, whether it is a modified CCD or CMOS machine or not. Unmodified machines can also be divided into two types: one with strong low-pass filtering effect and the other with weak low-pass filtering effect. Simply put, there is no strict requirement on what infrared filter to choose. Because the differences between machines are not considered.

1. If it is a machine modified with CCD or CMOS, that is, a machine with the low-pass filter removed, that is, the infrared cut-off film of ICF, any wavelength infrared filter can be used, depending on the effect to be achieved.

Generally, the infrared filter with wavelength above 760 nm has strong infrared effect, and the imaging effect is black and white. The disadvantage is that the exposure time needs to be longer.

The infrared filter with the wavelength below 760 nm has few infrared rays, and the imaging effect is fantastic in color and amazing in effect. The advantage is that the exposure time is very short.

2. If it is an unmodified machine, and the low-pass filtering effect is weak (most of these machines are old digital machines, and the technology at that time can't reach the point of strong low-pass filtering), then the band that can be used is best controlled between 650 nm and 850 nm, and it needs to be tested in person according to the models of various brands. There is no guarantee that all such old machines are suitable for 650 nm to 850 nm, because the infrared cutoff ability of ICF of each brand is different.

3. If it is also an unmodified machine, but the low-pass filter effect is very strong (most of these machines are new-generation digital machines), it is almost not suitable for infrared photography, because its ICF infrared cut-off filter ability is too strong.