(I was trying to add this to my first comment to you but I didn't see a way to edit.)There's a star * on your camera that can lock exposure. You may want to lock your exposure if it keeps changing even when the ISO is locked.1.) Diable AUTO LIGHTING ...
If that doesn't work, there's a star * on your camera that can lock exposure. You may want to lock your exposure if it keeps changing even when the ISO is locked.1.) Diable AUTO LIGHTING OPTIMIZER 2.) ISO (Set your ISO to 100 [or as low as possible] ...
Looking at your settings I believe there's more than one thing that's causing the automatic change or brightness. It could be the AUTO LIGHTING OPTIMIZER; You may need to disable it. I would also set my ISO to 100 and then use the SHUTTER SPEED to br...