When ISO speed is fixed, digital camera has at least six correct exposures that produce identical photo images theoretically.
To take clear and sharp photo without tripod and remote trigger, I put my camera on a box, mirror lock up is on, set the self-timer at two seconds.
The six correct exposures I experimented in my room under fluorescent light is below.
Aperture(f/#) Shutter speed (1/# second) ISO 1600
4.5 125(I made a mistake. It should be 4.0.)
5.6 80
8.0 40
11.0 20
16.0 10
22.0 5
f/4.5, 1/125s
f/5.6, 1/80s
f/8.0, 1/40s
f/11.0, 1/20s
f/16.0, 1/10s
f/22.0, 1/5s
Below two files contain EXIF data.
Original photo of f/4.5
Original photo of f/22.0
Freedom, World peace in unity! 