2. How does photography work?

3. The word photography, comes from two ancient Greek words: “Photo” which means light, and “Graph” which means draw.
Thus the phrase “Drawing with Light” is used to describe photography
When a photograph is “made”, light is used to record a picture of the object or scene on a light-sensitive surface.

4. Looking Inside the Camera
                                                                                           
                                                                                           
Looking Inside the Camera

5. The Camera and The Human Eye

6. The Camera and The Human Eye
lens
lens
The lens of the eye is like the lens of the camera
Both focus on an image

7. The Camera and The Human Eye
lens
Light sensitive retina
Digital Sensor or Film
lens
The RETINA of the eye is like the FILM or DIGITAL SENSOR of the camera
Both are light sensitive
Both are protected in a light-tight container

8. The Camera and The Human Eye
eyeball
lens
Light sensitive retina
Camera body
Digital Sensor or Film
lens
The EYEBALL of the eye is like the BODY of the camera.
Both have a mechanism for shutting off light

9. The Camera and The Human Eye
eyeball
lens
Light sensitive retina
Camera body
Digital Sensor or Film
lens
eyelid
shutter
The EYELID is like the SHUTTER of the camera
Both control the amount of time light is let in for

10. The Camera and The Human Eye
eyeball
lens
Light sensitive retina
Camera body
Digital Sensor or Film
lens
iris
aperture
eyelid
shutter
The IRIS is like the APERTURE
Both control amount of light

11. The Iris and Aperture
iris
pupil = aperture *

12. Contrasting the Eye and the Camera
A difference between eye and camera is that the eye adjusts automatically to high and low light conditions
The iris of the eye opens wide to allow as much light as possible to enter the eye in the dark. In a bright light the iris of the eye closes down to prevent too much light from entering.
Most adjustable cameras do NOT adjust for high and low light entering. Some of the newer cameras have semiautomatic features to help you regulate the amount of light entering the camera.

13. Contrasting the Eye and the Camera
Humans - observe only those details within their vision which are important to them. Their minds “filter out” all details except those to which they are paying attention.
The camera, on the other hand, tends to “see” all the details in view and to record them on the film.
So: as a photographer, you need to learn to think like a camera, taking everything into account in your scene to take amazing photographs

15. How many trees were there?

17. Camera Types
Compact Cameras (point and shoot) vs. Digital Single Lens Reflex (DSLR) Cameras

18. Viewfinder
Unlike compact cameras, with an SLR camera what you're seeing through the viewfinder is the same light that will reach your camera's sensor when you press the shutter button:
Compact Camera

19. Mirror Down
Mirror Up- When you press
The Shutter Button the mirror
Flips up and the light that was
Formerly being rerouted to
Your eye instead gets sent
Directly to the sensor.

20. 2. Fixed or Interchangeable Lenses
The fact that SLR cameras can change out their lenses is likely the first difference that one notices, or knows ahead of time.

21. 3. Camera Sensor Size
In general, compact cameras have much smaller camera sensors than SLR cameras. This is a less commonly known "under the hood" difference between SLR and compact cameras, but is likely one that will make the most noticeable impact on image quality.

22. Advantages of Compact Cameras
Live view rear LCD (although most newer SLR's have this feature) Greater range of pre-programmed creative modes No mirror/shutter mechanism that can fail after ~10-100K shots Cost – Generally much cheaper compared to SLR Convenience – Smaller easier to carry around

23. DSLR Advantages
Faster camera autofocus Ability to take exposures longer than seconds (using manual or bulb mode) Offers complete manual exposure control Manual zoom control (by twisting the lens as opposed to using an electronic button) Ability to upgrade just the camera body and keep all of one's lenses Much less shutter lag (delay between pressing the shutter and starting the exposure)

24. Summary: Compact vs. SLR
The preference between each camera type really comes down to one of: (a) flexibility and the potential for higher image quality versus (b) portability and simplicity. This choice often isn't a matter of which is right for a given person, but which is better for a given shooting environment and intended photo use.