Depth of Field

Dof: Depth of Field is the sharp area of the picture.

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Picture 4.1

There are three matters related to Depth of field:

1. Lens Focal Length  : The longer the lens focal length, the shallower the depth of field

2. Focus distance        : The closer the focus distance, the shallower the depth of field 

3. Aperture Number    : The smaller f number, the shallower the depth of field

Note: small f number = wide 

At a shallow depth of field backgrounds will be out of focus, and the farther away from the object, anythings appear more blurry.  

Let's make it easier with picture tests, the four pictures below are taken with 50 mm fix lense.

Picture 4.2:

30f2.8bg150 15f2.8bg65

Focus distance to 1st bottle 15 cm

distance 1st to 2nd bottle 30 cm

distance 2nd bottle to BG 1,5 m

F-Number 22.

Focus distance to 1st bottle 30 cm

distance 1st to 2nd bottle 30 cm

distance 2nd bottle to BG 65 cm

F-Number 2,8.

Focus distance to 1st bottle 15 cm

distance 1st to 2nd bottle 30 cm

distance 2nd bottle to BG 65 cm

F-Number 2,8.

Focus distance to 1st bottle 15 cm

distance 1st to 2nd bottle 30 cm

distance 2nd bottle to BG 1,5 m

F-Number 2,8.

Conclusion:

We should consider when we set the DOF that it is deep enough for showing the point and keep the point isolated.

Note: We will discuss it further more in other tutorial.   

 

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