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1- To change the camera setting to aperture priority I used the dial at the top of the camera from Manual which is represented with a letter "M" to "A" with represents Aperture priority.
2- When aperture changes the background of picture either gets blurrier and give the focus on one object or clears the background with also having the main object in focus.
3- It'd be best to use aperture priority when you want one object in focus rather than what is in the background.

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Aperture f/1.8
Shutter Speed 1/2500
ISO 100
I chose the rock painted as my object to photograph. With a shallow deep of field the rock is in complete focus. The backgrounds blurry giving the attention to the main object.

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Aperture f/8
Shutter Speed 1/125
ISO 100
With a medium depth of field, the rock is still the main focus but you can now the what the background is.

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Aperture f/16
Shutter Speed 1/30
ISO 100
In this photo I used a deeper depth of field, an aperture of f/16 making the picture almost all be clear.

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Aperture f/1.8
Shutter Speed 1/1000
ISO 100
This photo shows shallow depth of field because the first box is in focus and everything else is blurred.

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Aperture f/8
Shutter Speed 1/50
ISO 100
This picture though it was being focus on the first box, the medium depth of field kind of blurred it out and focused it a bit more on the middle box, having a bit more clearness in the rest of the picture

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Aperture f/16
Shutter Speed 1/13
ISO 100
In this photo a deeper depth of field made the boxes pretty much come out clear rather than having just one box or some of the picture and its background clear.

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This photograph shows deep depth of field because most of the picture is clear besides the very very far back. It shows more detail of the background than shallow deep depth of field would show.

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This picture of a kitten is a good example of shallow depth because only the kittens face is in focus. The background and even its legs and paws are blurred out. I think that the aperture might have been f/1.5 because its super blurry.