I used a Pentax K50 camera, which was not bad before. I don't know what's going on now. The photos are all black. No matter how the parameters are adjusted, it is useless.

(1) When you say black, it should be black and white, right? The color disappeared.

(2) There are natural, vivid, black and white, miniature landscape and other image style settings in the menu. It would be nice to change it to nature.

(3) If the overall photo is dark and underexposed, it may be that the shutter is faulty. Try the maximum aperture and try again.