The experiment is to take three photographs of exactly the same thing, one photo at the lowest setting your lens will allow, one middle of the range and one at the highest setting, making sure each photo is focussed on the object.
You should see something similar to this happening.
The first photo is taken with an aperture setting of 2.8
The second is taken with an aperture setting of 8
The third is taken with an aperture setting of 16
You should notice as the setting increases so does the depth of field, bringing more of the background into focus as well.
Your every thing is really perfect. Such a you have great photographer because you have done this three experiment, just interesting. I appreciate for you.
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