I shoot almost always in full manual, not auto-exposure. When I went out shooting, out of the blue, on my first shot, (and I did set the exposure to the correct shutter speed and aperture to match the ISO), the image came out horribly overexposed. I tried it in auto, and it captured the picture perfectly, but in manual, program, aperture priority, and shutter speed priority, the light meter gets it wrong.
I looked in the menus to see if I changed a setting that would make this happen, but there were no settings like that, as it is an old camera and doesn't have all the new modern settings.
I don't want to buy an external light meter, as it would make things more complicated for every photo, and also they cost a lot of money that I don't have the finances to spend, as I am just an amateur.