Hey there! I hope this is the right place for this kind of questions! I just bought myself a second hand Nikon D5100 to film my home videos with. I upload them on YouTube and it's just something I like to do. I sit in front of the camera with a black background behind me and with lighting. I have a few problems with how the camera is behaving and I'm sure there are ways to fix them in settings: 1. when the camera is focused on my face it adjusts the whiteness/lighting really well so my face isn't over-exposed and the black background behind me is dark. As soon as I look down or do anything to remove my face from the frame it tries to focus on the black background and it makes it brighter! When I put my face back into the frame it is wayyyy over exposed and it takes a few seconds (or i have to click the little focus button) for it to re-adjust again. Is there a way to lock the exposure, like in an iPhone? so the camera doesn't try to compensate for changes in lighting? since there are no changes in lighting because i'm filming in a controlled environment! 2. is there a way to lock and fix the focus distance (aperture?) as well? the camera tries to track my face and keep focus on it but it does struggle sometimes. since i am sitting in one place i'm wondering if i could just fix the camera's focus on the certain distance i am sitting away from it so it doesn't ever need to refocus, etc! I think that's it for now, i'd love help from you guys! and yes, i know i am very novice! that's why i bought an older model for not very much money so i can learn these things haha!