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Understanding aperture

From: Up and Running with DSLR Filmmaking

Video: Understanding aperture

Brian Liepe: Okay, so one of the most effective ways to adjust your exposure in your camera is by adjusting the aperture. The aperture is a mechanism inside the lens that's made up of a series of blades that either let light in or keep it out. Now you usually interface with this aperture through your camera. Chad Perkins: The openness of the aperture is measured using a degree of measurement called an f-stop. Now because aperture is a function of the lens exact settings will vary from lens to lens.

Understanding aperture

Brian Liepe: Okay, so one of the most effective ways to adjust your exposure in your camera is by adjusting the aperture. The aperture is a mechanism inside the lens that's made up of a series of blades that either let light in or keep it out. Now you usually interface with this aperture through your camera. Chad Perkins: The openness of the aperture is measured using a degree of measurement called an f-stop. Now because aperture is a function of the lens exact settings will vary from lens to lens.

Now another feature of aperture is it controls focus, so in other words your depth of field, and we will talk about that a little bit later. Brian Liepe: The unit of measurement that represents the size of your aperture is called an f-stop. That can be a little bit tricky because the lower the f- stop number, the bigger the aperture, and vice versa. The higher the f-stop number, the smaller the aperture. Now we've covered the basics of aperture, but if you're curious, we are going to explain a little bit more about the technical details regarding f-stops. Chard Perkins: The reason why f-stops increase as the size of the aperture decreases is that because F stands for fraction.

So if you have an f-stop of f/4, this really means that the aperture is open to one fourth of the size of the focal length of the lens. Brian Liepe: So if we had a 100 mm lens and our f-stop was a value of f/4, the aperture diameter would be 25 mm. If we increase the f-stop to f/8 on the same lens, we are now closing the aperture to 1/8th of its focal length. So the diameter of the aperture is now 12.5 mm. Chad Perkins: In the next tutorial, we will look a little bit more closely at how aperture relates to focus.

We will also look at some of the pros and cons of adjusting your exposure by using your aperture.

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This video is part of

Image for Up and Running with DSLR Filmmaking
Up and Running with DSLR Filmmaking

43 video lessons · 25336 viewers

Chad Perkins
Author

 
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  1. 2m 10s
    1. Welcome
      1m 25s
    2. About the camera used in this course
      45s
  2. 11m 35s
    1. Understanding photography
      44s
    2. Understanding aperture
      1m 51s
    3. Trade-offs with aperture adjustment
      2m 32s
    4. Understanding shutter speed
      1m 26s
    5. Trade-offs with shutter adjustment
      2m 41s
    6. Understanding ISO
      44s
    7. Trade-offs with ISO adjustment
      1m 37s
  3. 6m 37s
    1. Understanding sensor size
      1m 19s
    2. Protecting highlights and native ISO
      1m 24s
    3. Getting a custom white balance
      2m 27s
    4. Focusing for video
      1m 27s
  4. 9m 24s
    1. Using lenses
      1m 51s
    2. Understanding wide lenses
      2m 39s
    3. Understanding long lenses
      2m 32s
    4. Getting shallow depth of field
      2m 22s
  5. 12m 34s
    1. Using graphs to gauge exposure
      2m 1s
    2. Recording audio
      2m 42s
    3. Using a clapperboard
      1m 13s
    4. Shooting a "flat" image
      51s
    5. Using custom color profiles
      54s
    6. Shooting slow motion
      1m 19s
    7. Getting a beautiful shot
      3m 34s
  6. 13m 33s
    1. Why use Premiere Pro for editing?
      1m 21s
    2. Transcoding video
      2m 29s
    3. Combining video and audio streams
      2m 7s
    4. Cleaning up noise and adding grain
      3m 26s
    5. Color correcting footage
      4m 10s
  7. 6m 1s
    1. About DSLR pitfalls
      30s
    2. Avoiding rolling shutter
      51s
    3. Avoiding moiré
      1m 6s
    4. About limited latitude
      1m 56s
    5. About extreme compression
      1m 38s
  8. 7m 27s
    1. Why you need a monitor
      58s
    2. Using a viewfinder
      52s
    3. Stabilizing your camera
      1m 43s
    4. Moving your camera
      35s
    5. Using a follow focus
      37s
    6. Using a matte box
      1m 8s
    7. Using neutral density filters
      1m 34s
  9. 1m 17s
    1. The future of DSLR video
      54s
    2. Final thoughts
      23s

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