Not only can it be used for photography, but also for direct visual observation: **IR-cut 650 infrared cut filter**---Blocks the interference of infrared rays, resulting in higher contrast and sharpness for clearer observation. Only allows 400-650nm light to pass through, avoiding issues like interference, blurriness, low clarity and poor sharpness caused by stray light in other wavelength bands. The visual observation method is the same as ordinary filters: just screw it onto the eyepiece, and the effect is stunning. You can perform a simple test by observing the moon. The visual observation method is the same as ordinary filters: just screw it onto the eyepiece, and the effect is stunning. You can perform a simple test by observing the moon.