Apperature exercise

 We were told to bring a DSLR camera and a tripod on that day.
After we have done setting up the tripod and camera,

we were instructed to focus on the subject which is the  handrail,

 and set our aperture to the lowest. Mine is F4.5

For the 1st exercise,

shutter speed and Iso are constant throughout the whole experiment.
We can only change the aperture to the next stop.
I took the picture up to F22.



For the second exercise,the subject is the same.
But the shutter speed was adjusted until the indicator stay in the middle,

 which means aperture and shutter speed is increasing simultaneously.