Practice 1: Depth of field and shutter speed

The following photos are going to illustrate the difference between great depth of field and less depth of field, 
also the difference between slow shutter speed and fast shutter speed. 

I. Depth of field

It is a term to explain the distance between the object and camera so to get a sharp,

or only to focus an object  in a photo.

The above photo was shot with lens 55mm, f/5.6 aperture, shutter speed 1/500s and ISO 400

with further focusing disdance.

The above photo was shot with lens 55mm, f/5.6 aperture, shutter speed 1/800s and ISO 400

with nearer focusing distance.

We can see that under the same lens mm and aperture, the further distance i shoot (the first photo),

 the sharper picture it is, which every elements in photo are all clearly seen.

The photo has greater depth of field.

But with nearer distance i shoot (the second photo), the background is blurred 

but with a focused object (the sign) in it.

The photo has least depth of field.

Here is another example:

Greater depth of field of clearer elements in photo.

(Lens 55mm, f/5.6 aperture, shutter speed 1/100s and ISO 100)

Least depth of field of blurred background with a focused object.

(Lens 55mm, f/5.6 aperture, shutter speed 1/100s and ISO 100)

II. Shutter speed

According to John Ingledew(2005), it is the term to explain the timing of a camera to take a photo,

and how long to let light comes in lens of camera.

(The following photos are all taken with lens 55mm, f/5.6 aperture and ISO 400)

With shutter speed 1/100s, which allowed more time to let light came in camera,

this photo illustrates the lighter effect under the slower shutter speed. 

In contrast, with shutter speed 1/320s, which allowed lesser time to let light came in camera,

this photo illustrates the darker effect under the faster shutter speed.