Camera Basics - Aperture — Transcript

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1. 0:00‏what is aperture perhaps the most
2. 0:03influential parameter of photography
3. 0:05aperture plays an important role in
4. 0:07composition and setting up a shot let's
5. 0:09take a closer look simply put aperture
6. 0:13is the hole in the lens through which
7. 0:15light travels into the camera body and
8. 0:17on the camera sensor to understand let's
9. 0:20look at the human eye all cameras are
10. 0:22designed like human eyes
11. 0:25corne to front of gather
12. 0:31‏ir ir
13. 0:33exping si of
14. 0:36p e the pup is what we refer to as the
15. 0:40aperture in photography the amount of
16. 0:43light that falls onto the retina is
17. 0:45determined by the size of the pup the
18. 0:47larger the pup the more light falls onto
19. 0:49the retina the larger the aperture of
20. 0:52the lens the more light enters the
21. 0:54camera the iris of the lens controls the
22. 0:57size of the aperture and is called the
23. 0:59diap
24. 1:00‏diap is block all light exception of
25. 1:04the that goes through theer in
26. 1:06photography aperture is expressed in f
27. 1:09numbers also known as f stops f stops
28. 1:13are way of describing how open or closed
29. 1:15the aperture is the smaller the f stop
30. 1:18means a larger aperture while a larger f
31. 1:20stop means a smaller aperture this can
32. 1:23be tricky remember since large fops
33. 1:26smaller sizes fop f 1.4 is larger than
34. 1:32f2.8 and much larger than f8 or
35. 1:36f11 aside from controlling the amount of
36. 1:38light passing through the lens and into
37. 1:40the camera the aperture has a direct
38. 1:42impact on the depth of field the area of
39. 1:45the image that appears sharp a large f
40. 1:48number such as f16 will bring all
41. 1:51foreground and background objects into
42. 1:53focus while a small f number such f1.4
43. 1:57will isolate either the foreground or
44. 1:59background
45. 2:00‏and everything else
46. 2:02blurry every lens has a limit on how
47. 2:05large or small the aperture can get if
48. 2:08you take a look at the specifications of
49. 2:09your lens it should indicate the maximum
50. 2:12apertures lowest f numbers and minimum
51. 2:15apertures highest f numbers the maximum
52. 2:18aperture of the lens is much more
53. 2:20important than the minimum aperture
54. 2:22because it shows the speed of the lens
55. 2:24lenses with apertures of f1.4 or f2.8
56. 2:28are considered fast lenses ‏because they
57. 2:30can pass more light into the camera than
58. 2:32for example a lens with a maximum
59. 2:34aperture of f4 or
60. 2:37f5.6 that's the reason night photography
61. 2:40usually requires fast lenses the minimum
62. 2:43aperture of a lens is usually not
63. 2:45important and should rarely be used as
64. 2:47diffraction will cause the image to lose
65. 2:49clarity it is also worth noting the two
66. 2:52types of lenses primes and zooms prime
67. 2:55lenses have a fixed focal length meaning
68. 2:57they cannot zoom without physically
69. 2:59moving closer ‏or further away from the
70. 3:01subject zoom lenses give you the
71. 3:03flexibility for you to zoom in or out of
72. 3:05an object while remaining
73. 3:07stationary while prime lenses will have
74. 3:09a fixed maximum aperture the maximum
75. 3:12aperture of a zoom lens will often get
76. 3:14smaller as the focal length increases
77. 3:17these lenses are called variable
78. 3:19aperture lenses this is important
79. 3:21because for a zoom lens with a focal
80. 3:23length of 70 to 200 mm the aperture may
81. 3:26increase from f3.5 to f5.6
82. 3:30‏decreasing the amount of light entering
83. 3:31the
84. 3:32camera because aperture controls the
85. 3:34amount of light entering the camera it
86. 3:36also affects other parameters such as
87. 3:38iso and shutter speed a larger aperture
88. 3:41or smaller f number will let more light
89. 3:44into the camera allowing you to use a
90. 3:46faster shutter speed or lower iso value
91. 3:49this is beneficial to eliminate motion
92. 3:51blur and reduce the amount of noise that
93. 3:53your camera will produce if its iso gets
94. 3:56bumped up faster shutter speeds can be
95. 3:59essential
96. 4:00‏lots motion sps and wild photography so
97. 4:04a fast lens can help increase shutter
98. 4:06speed decrease iso value if your shutter
99. 4:09speed is set to a specific value fast
100. 4:11lenses are also imperative for any kind
101. 4:13of nighttime photography whether you're
102. 4:16taking pictures of the milky way or
103. 4:17doing a moonlit phot shoot large
104. 4:20apertures will let as much light in as
105. 4:22possible small apertures can use as
106. 4:25shooting landen requires
107. 4:28croc
108. 4:30‏shp any out focus areas that
109. 4:33come to enable man adjust of aperture
110. 4:36valu camera to either aperture priority
111. 4:39or manual mode aperture priority will
112. 4:42let you change aperture vales man while
113. 4:44leaving shutter speed and iso up to the
114. 4:47camera's internal metering system manual
115. 4:50mode lets you control every aspect of
116. 4:52the camera allowing you to change iso
117. 4:54aperture and shutter speed i personally
118. 4:58my camera inure
119. 5:06‏ens and ceras to the best of their
120. 5:08ability aperture is probably the most
121. 5:11stylistic setting you can change on your
122. 5:12camera allowing for unique effects that
123. 5:15can take
124. 5:17your