1. Aperture & Depth of Field

2. aperture affect exposure?
How does the
aperture affect exposure?
A WIDE/LARGE f/stop is a SMALLER number (f/2) = OPENS the aperture for MORE light A SMALL f/stop is a LARGER number (f/22) = CLOSES the aperture for LESS light.

3. How does the aperture affect
depth of field?
An example of shallow depth of field (large f/stop)...
This photo was taken with an f/stop of f/2.0. Wanted to really focus on the contrast between the pretty headband and the dirty toddler fingers, a large f/stop to really narrow down the depth of field was used. As you can see, the main areas of focus in the picture are the fingers and the jewels on the headband, with everything else in the image much softer. Shutter speed of 1/125 and an ISO of 400.
An example of a wider depth of field (smaller f/stop)...
Smaller f/stop of f/10 was used to take this image of the sunset in Hawaii. We wanted the scene to be mostly in focus, and you can see that for the most part the foreground, middle and background of the image are all in focus. Shutter speed of 1/160 and an ISO of 100.

4. f/22 f/2.8 f/1.2 Depth of Field and Aperture
There are a number of results of changing the aperture of your shots that you’ll want to keep in mind as you consider your setting but the most noticeable one will be the depth of field that your shot will have.
Depth of Field (DOF) is that amount of your shot that will be in focus. Large depth of field means that most of your image will be in focus whether it’s close to your camera or far away. For example the landscape shot above has an aperture of f/16 and the result is that both the mountain in the background and the boats in the foreground remain in focus.
Small (or shallow) depth of field means that only part of the image will be in focus and the rest will be fuzzy (like in the portrait at the top of this post. You’ll see in it that the subjects eyes are in focus but the background is blurred. Even her hair which is only a little behind her eyes is blurred. This is a very shallow depth of field and was taken with an aperture of f1.8).
Similarly this creative birth announcement image was shot at f1.8 and again you see the shallow depth of field with the ultrasound in focus but everything else blurred.
Aperture has a big impact upon depth of field. Large aperture (remember it’s a smaller number) will decrease depth of field while small aperture (larger numbers) will give you larger depth of field.
It can be a little confusing at first but the way I remember it is that small numbers mean small DOF and large numbers mean large DOF.

5. A comparison of how aperture setting can
affect the exposure of an image
The above photos have the exact same shutter speed and ISO setting (1/250, 400) and only changed aperture. You can see how the larger the aperture (the smaller number) the more light is let in, the smaller the aperture (larger number) the less light is let in.

6. A comparison of how Aperture setting can affect the
Depth of Field of an Image
In the photos above all three of settings have been adjusted to achieve correct exposure of the scene (no blown out or over-exposed highlights and good detail in the shadow). By looking at the scene behind the little bear, you can see that in the first image with the larger f/stop (f1.4) the background is totally out of focus and blurry. With a slightly smaller aperture we start to see that background come in to focus, and with the last photo that has the smallest aperture (f/16) the background is clearly in focus and you can make out the swings and other detail in the background.

7. REMEMBER
Aperture f/stop numbers & Exposure Small number = more light Large number = less light Aperture f/stop numbers & Depth of Field Small number = Small depth of field Large number = Large depth of field

9. View – Analyze – Discuss
Differences

10. View – Analyze – Discuss
Differences
Source:

11. CAN YOU TELL THE DIFFERENCE