Aperture,
In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture of an optical system is the opening that determines the cone angle of a bundle of rays that come to a focus in the image plane.
Shutter ,
A photographic device that administers the exposure by limiting the time over which light is admitted.
Exposure ,
In photography, exposure is the amount of light allowed to fall on each area unit of a photographic medium during the process of taking a photograph .
Depth of field,
depth of field is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image.
F-stop,
In optics the f-number (sometimes called focal ratio, f-ratio, f-stop, or relative aperture) of an optical system is the ratio of the lens's focal length to the diameter of the entrance pupil .
Focal length
The focal length of an optical system is a measure of how strongly the system converges or diverges light.
1
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Power switch
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16
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EF-S lens mount index
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2
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Display button
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17
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Flash sync contacts
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3
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ISO speed setting button
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18
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Hot shoe
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4
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Main dial
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19
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Focal plane mark
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5
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Shutter button
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20
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Strap mount
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6
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Red-eye reduction lamp
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21
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Microphone
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Self-timer lamp
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22
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Flash button
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7
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Remote control sensor
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23
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Terminal cover
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8
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Grip
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24
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Lens release button
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9
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Mirror
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25
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Depth-of-field preview button
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10
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Contacts
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26
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Audio/video out
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11
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Lens mount
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Digital terminal
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12
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Lens lock pin
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27
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Remote control terminal
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13
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Mode dial
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28
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External microphone in terminal
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14
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Built-in flash
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29
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HDMI mini out terminal
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AF-assist beam
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30
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Body cap
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15
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EF lens mount index
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