Portraits

Depth of FieldDepth of Field&&

PortraitsPortraits

Depth of FieldDepth of Field

►What is depth of field?What is depth of field? Depth of Field is the area that is in focus Depth of Field is the area that is in focus

within the picturewithin the picture This includes the area in front of your This includes the area in front of your

subject and the area behind your subject subject and the area behind your subject that is in focusthat is in focus

►What does Depth of Field look like?What does Depth of Field look like? In the following photographs we will see In the following photographs we will see

three photographs taken from the three photographs taken from the identical viewpointidentical viewpoint

See if you can identify the differences See if you can identify the differences between thembetween them

What is the difference between What is the difference between these photographs?these photographs?

How do we describe the difference?How do we describe the difference?

How do we control depth of How do we control depth of field?field?

►Think back to the Project Pinhole what Think back to the Project Pinhole what did we do?did we do? We used three different aperture sizesWe used three different aperture sizes

►How did the aperture sizes change the How did the aperture sizes change the overall focus of the image?overall focus of the image? The smaller aperture gave us …The smaller aperture gave us …

►How do you control the size of the How do you control the size of the aperture on your camera?aperture on your camera? The aperture ring or button of course The aperture ring or button of course

ApertureAperture

►When we talk about the size of an When we talk about the size of an aperture on a camera how do we talk aperture on a camera how do we talk about it?about it? We refer to them as We refer to them as F-stops.F-stops.

►What is the normal range of F-stops?What is the normal range of F-stops? 2, 3.5, 4, 5.6, 8, 11, 16, 222, 3.5, 4, 5.6, 8, 11, 16, 22

►Which one is the larger aperture?Which one is the larger aperture?

Explanation of F-stopsExplanation of F-stops►Why is a large aperture expressed as a Why is a large aperture expressed as a

smaller number and a smaller aperture as a smaller number and a smaller aperture as a large number?large number? F-stops are a ratioF-stops are a ratio They express the diameter of the aperture They express the diameter of the aperture

compared to the length of the lens’ focal lengthcompared to the length of the lens’ focal length So F2 means that the aperture diameter is ½ the So F2 means that the aperture diameter is ½ the

length of the lenslength of the lens

Here is a chart that explains it Here is a chart that explains it conciselyconcisely

How can it affect your How can it affect your portraitsportraits

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