How Apperture (f-number) affect DOF

I had running a test on how apperture (f-number) affect DOF while i am doing macro in Bukit Gasing.
It is actually the basic of photography. But still, a nice thing to share with all.
From the theory , stated that the smaller apperture used (big f-number) , the more DOF you can gain. Let see how this work..

Fungus Weevil @ f4


Fungus Weevil @ f6.3


Fungus Weevil @ f8


Fungus Weevil @ f11


Fungus Weevil @ f13


Fungus Weevil @ f16



Lets look at the details of the bugs (Fungus Weevil) and the blurred background, from f4 to f16, the higher f-number (smaller apperture) used , the more details on the Fungus Weevil we get and background is less blurred, means that the more DOF we gain. So in conclusion , if you want more details in your shot , use a small apperture (e.g landscape, macro, etc..) and if you want blurred background, use big apperture (e.g portraits, etc..),
However , we are been advised not to use f number more than f16 as it will make your shot looks soft.