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1: To change the camera to aperture priority we turned the dial at the top of the camera to the A.
2: When the aperture changes the depth of field of a photo gets shallower or deeper. Meaning that the picture overall gets more clear throughout the whole photo or the background is blurred and the camera is focused on one part of the picture.
3: You would use aperture priority if you really wanted a clear focal point of an image. Its best to used for very detailed images.

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From the looks of this photo, the aperture is probably around F/1.8 because most of the background is blurred and the cat's face is the main point in focus.

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Because this is a landscape picture, the aperture is probably at F/16 since just about everything is in focus and clear.

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Aperture: F/16
Shutter Speed: 1/45
ISO: 100
This photo was taken with a deep depth of field. Now just about every part of the flower bush is in focus. In my opinion, too much is in focus and it's make the photo very over-baring.

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Aperture: F/8
Shutter Speed: 1/180
ISO: 100
This is a photo of the same flowers. This photo brings more of the background into focus. More leaves and other parts of the flower bush are now clear.

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Aperture: F/1.8
Shutter Speed: 1/4000
ISO: 100
This photo of flowers has a shallow depth of field. The flowers closest to the camera are the most clear and in focus. Everything in the background is blurred.

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Aperture: F/16
Shutter Speed: 1/10
ISO: 100
This the photo with the deepest depth of field. Nearly every box is in focus. Though the middle box is the main focus, the other two have come into focus, although they aren't 100% clear.

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Aperture: F/8
Shutter Speed: 1/45
ISO: 100
The main focus is still the middle box in this photo. Now the other two boxes appear to be more clear, but are still blurred. The depth of field is wider than the first photo.

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Aperture: F/1.8
Shutter Speed: 1/350
ISO: 100
In this photo, the box in the middle is in focus. The other two boxes are out of focus making it a photo with shallow depth of field.