Exposure
by A Thomsom
1. Exposure directly determines the feeling presented in your final image. This is why exposure is so important to the creative process.
2. Over Exposure Creative uses
3. Example of Exposure changes on the shot of a city
4. Shutter Speed -> 1/40 - 1/400
5. ISO -> 400 - 6400
6. Exposure Example
7. Underexposing revealed only one half, making the scene much more dramatic.
8. A neutral exposure revealed both sides of our subject's face.
9. Overexposing can have interesting results.
10. Exposure Triangle
11. Over exposing can enhance certain elements and areas of photographs. Effects often include a high dynamic range as the dark areas will become much darker and the light areas will overwhelm the rest of image. This can be used to create a very bleached looking photograph with high contrast. This effect is achieved because too much light is allowed to enter the camera during exposure.
12. Over Exposure Creative uses
13. In summary, the definition of exposure in photography is how light or dark an image will appear after being captured by your camera.
14. Examples of how ISO, Shutter speed and Aperture affect exposure.
15. There are three camera settings: aperture, ISO and shutter speed also known as the exposure triangle which affects the exposure.
16. What is Exposure?
17. Under exposing can be used to highlight the subject and convey a mood in the photograph. Underexposure is achieved by reducing the amount of light that enters the camera so the image will be darker, however using this creatively can achieve a nice photograph, the darker areas will be darker and the highlights won’t be as bright.
18. The Exposure Triangle
19. How can exposure be used creatively?
20. What is over and under exposed?
21. Overexposure occurs when too much light is allowed into the sensor, resulting in an image that is considered to be much brighter than it should be.
22. An underexposed image is the sort of photograph that one might consider to be too dark. It’s shows very little detail, only the brightest parts are easily discernible.
23. Compare these two images. While the top image is much too dark (overexposed), the one on bottom is much too bright (underexposed), to the point where it is uncomfortable to look at. Both are equally lacking in easily-distinguishable detail, and do no justice to the highlights or shadows of the objects captured.
24. Reference Image 2
25. Reference Image 1
26. Aperture F5 Shutter Speed 1/40
27. Aperture F5 ISO 400
28. Adjustments are made to these variables to make up the desired result for the photograph. By understanding the exposure triangle it allows you to have more control over your photos and makes you become far more familiar with the way your camera works. By adjusting these variables you are controlling the levels of light that enters the camera, thus affecting how your photograph will end up looking.
29. With certain cameras the exposure triangle can be calculated by a in-built meter. As long as the you, the user have set two of the three variables the camera will select the correct value for the third variable.
30. Aperture determines and allows control over how much of an image in is focus. Sports photographers are interested in the shutter as the shutter speed controls motion. You can either freeze motion or show motion. As a higher ISO allows the camera to be more sensitive to light it also produces a more noisy image. At certain ISO levels which changes from camera to camera the image quality will be affected due to this noise. Extra Resources: https://www.youtube.com/watch?v=3eVjUrY9a9c
31. Exposure is the amount of light per unit area reaching the photographic film/image sensor in a camera.
32. What is the "perfect" exposure?
33. Artistically, a perfect exposure is one that successfully conveys the atmosphere and feeling that the photographer wants to impart unto their audience
34. From a technical point of view, a perfect exposure would be one that accurately captures a photo, as true as possible to the real scene.
35. In this image, the artist decided the camera's "perfect exposure" was too dark at 0, so they decided to bump the stop up to +1.
36. The histogram feature, which shows a visual representation of an image's highlights and shadows, can be used to find a good exposure, as shown below.
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39. How exposure affects a photo
40. Aperture Range
41. Aperture -> Controls the lens’ diaphragm, which controls the amount of light traveling through the lens to the film plane. Wider aperture means more light enters so it increases exposure but this also decreases the depth of field.
42. Aperture
43. Aperture -> 5 - 16
44. High ISO noise
45. Creative uses for high exposure
46. High exposure photography
47. ISO Speed -> ISO determines the image sensor’s sensitivity to light, each value of the rating represents a “stop” of light, and each additional ISO number (up or down) represents a doubling or halving of the sensor’s sensitivity to light. Higher ISO is usually used in darker settings but this would create noise. Increasing ISO also increases exposure.
48. Shutter Speed -> Controls the duration of the exposure and is measured in fractions of a second. The shutter speed controls how long light enters the lens and hits the image sensor. The lower the shutter speed the more time is allowed for the light to hit the image sensor making the image brighter, however this causes motion blur.
49. ISO
50. Shutter Speed
51. Aperture example
52. Shutter Speed examples
53. ISO examples
54. ISO 400 Shutter Speed 1/50
55. The Exposure triangle is foundation for everything about photography. An exposure triangle is the most common way to put the three variables that make up exposure of a given photograph. These three variables are shutter speed (lower shutter speed number the longer the shutter will stay open the more light can enter the lens) ISO (sensitivity to light) and aperture (allowing for more light to enter the camera as the lower the aperture the wider the lens opens).
56. Aperture example
57. Increase in ISO increase in light
