SLR cameras shoot the same object, some with good colors and some with dark colors. What happened? If you have photography lovers, please add my friend's guidance. Thank you.

Being in the A file, that is, aperture priority, different aperture values, different ISO, different metering methods and different metering points will all cause changes in exposure parameters, and the films taken will definitely be different. For example; Spot metering, your metering point is on the bright side or the dark side of the object, and the corresponding shutter speed will change. Of course, the films made are different.