photography of crime scene

Hello! According to your description, it is obvious that ISO is too high. Should be lowered. Excessive ISO is the root cause of noise.

When shooting at night, please try to use the M file, that is, the manual file. Use tripod correctly to prevent hand shock. The aperture setting data should be as large as possible, and the shutter speed should be slow ~ please adjust it according to your environment at that time. What camera sets ISO to 1600, and the imaging degree is extremely poor ~ Feel it casually. Have a nice day!