Understanding Aperture

1. Small Depth of Field, Lowest f/stop:

2. Large Depth of Field, Highest f/stop:

                                 ISO:                             Aperture:                        Shutter Speed:

Photo 1:                   1600                                f/4.0                                    1/160

Photo 2:                   1600                                f/22.0                                  1/6

What is Aperture?

Aperture is the size of the opening in the lens when a picture is being taken. 

How does Aperture work technically (in the camera)?

Based on the settings, the opening in the lens stays opening as long, or as short, as the operator wants it. The longer the lens is open, the more light that is let in. 

How does Aperture work visually (in the picture)?

When a picture is taken with a low f/stop, there is a shallow depth of field, and the subject will come out separated from the background, as shown in photo one. The background is more blurry. If there is a high f/stop, less light enters, and there is a larger depth of field. The whole photo will come out entirely clear. 

What is the relationship to the exposure triangle?

The exposure triangle compares the three settings aperture, ISO, and shutter speed. After this shooting assignment, it is evident that, with a set ISO, as aperture decreases, shutter speed increases; furthermore, as aperture increases, shutter speed decreases.