Camera and Light

Exercise in class we had to do use our camera and flash meter to do reading at f8 as start then one f5.6 and f11 on the white, black and grey background, as you can see, trying to do this wasn't easy, using a flash meter was my first time so all the reading were not don't as it was ask... and didn't take any note to why i only shoot 3 times f8 1/50 on the white