Working with Nikon D 7000

Death of field refers to the range of distance that appears acceptably sharp. It varies depending on camera type, aperture and focusing distance, although print size and viewing distance can also influence our perception of death of field.
To took my photographs I have used Nikon D 7000. When I was taking photos to present the depth of filed immediately in front of or in back of the focusing distance begins to lose sharpness.
The depth of field we can divide into low depth of field (shallow depth of field) and hight depth of field (deep depth of field).

Low depth of field - to create this kind of effect I required a wide aperture like f/ 2.8 or wider.

On the first photography I had bigger aperture while the sky is more dark than on the second one.

This photograph shows that when I was focusing on the front thing the background lose sharpness. 

The same situation occurs in this photography as in the previous one. However, this time the final effect is sufficient for me.

High depth of field - to achieve the effect of deep depth of field I needed an aperture setting of f/ 16 or smaller.

The final effect of hight depth is in my opinion perfect, because it is not too dark or there is not too much light.

Slow shutter speed it means that more light come into the camera. It means that anything that moves in the scene will blur. 

slow shutter speed with hight f-number

The slow shutter speed blurs the jets of water in the fountation

Fast shutter speed it means that less light come into camera so that freeze movement.

fast shutter speed with low f-number

The fast shutter speed appears to stop the water in its tracks