The girls were watching Star Wars on the TV in the family room so I couldn't get my normal politics fix during lunch today and instead had my grilled cheese and soup at my desk (in my cave). I decided to mess around a bit with my camera taking some close up shots of my grilled cheese sandwich. Since my cave is dark, the flash popped up. I snapped the pictures on full auto, not customizing anything. I snapped about half a dozen pictures. I noticed a few things other than the more orange cheddar is the worse it tastes.
In this shot, I pushed in very close with the camera and saw "vignetting" which I had read about but never seen. The subject was so close that the lens actually cast a shadow on the plate in front of my sandwich.
In this shot, I tried changing the angle to see if I could more detail from the oozing cheese. The vignetting actually got worse.
In this shot, I backed away with the camera and used the zoom to push in close. The vignetting is mostly gone. But, I noticed int this shot (and the others) that the depth of field is so shallow that parts of the sandwich (the very front and very back) are actually out of focus. I'm guessing the depth of field is so shallow because the aperture was wide open (due to the dark room) and because I was so close to the subject.
I was just messing around. If I really wanted to get a better shot of the sandwich, I'd turn on some lights and back away a little bit.