Thanks for your response guys.
Actually I’m using a Nikon D5300. Sorry for the confusion.
I’m using the manual setting now, With an aperture setting of a f6.3, and a Shutter speed setting of 1″.
I’m shooting a closeup of a white piece of plastic, with a light shining directly on it. I have the plastic subject on a lazy susan.
When I turn the lazy susan, when the plastic is parallel to the lens, it looks like there might be some light reflecting off of it into the lens?
I say this because I’m still getting the color and brightness variations. I try to fix them in post, but boy is it a bear!