1. Digital Camera Workshop for Seniors
Intoduction

2. How cameras work Very similar to the way we all see (sight)
How do our eyes work?

3. How our eyes see Look at an object Our Eyes see it upside down
Out brain process what the eyes see
Put it the right way up

4. How is this similar to a camera?

5. Camera similar to our eyes
A camera records light
Must have a light source
Light goes through a lense
Aperture (like the Iris of our eye)
Shutter (like opening & closing eyes)
Sensor (same as optic nerve)

6. Must have light
Just like we can not see in total dark either can a camera. (see below)
However using some techniques cameras can record even the smallest amout of light
Some cameras can record infra red light that we can not see

7. Light source Usally sunlight or artifical light
Can come from Camera itself (flash)
Could come from outside our solar system (stars)

8. Lense Used to concentrate light on the sensor
And have the image in focus
Can be the most expensive part of a camera
Are many different types that perform different function. Eg zoom
The fact that light goes through a lense reduces the amount of light reaching the sensor

9. Aperture Restricts the amount of light reaching the sensor
Are talked about in F-numbers
The bigger the F-number the smaller the Aperture (less light gets to the sensor)
The smaller the F-number the bigger the Aperture (more light gets to the sensor)

10. Aperture
Open and close like the Iris (coloured area) of our eyes

11. Shutter Determins how long the light is on the sensor
Is talked amout in time
Usally fractions of a second eg. 1/250 or 1/1000
The longer the time the more light reashes the sensor
The shorter the time the less light reashes the sensor

12. Shutter

13. Sensor Converts light to computer (digital) signal
Then passes that signal to the digital processor (computer within the camera)
There are two types of sensors
CCD (Charge Couple Devise)
CMOS (Complementary Metal–oxide– Semiconductor)

14. Sensor
The degree to which the sensor is effected by light can be adjusted
This is called the ISO speed
A low ISO speed requires a longer exposure to light and is referred to as slow
A high ISO speed requires a shorter exposure to light and is referred to as fast

15. CCD
CCD-Colorsensor

16. Processor May adjust the image in some ways
May compress the image to make it small so you can fit more images on your memory card
Save the image to the memory card
Also allows images on memory card to be viewed
Provides the interface to enable you to use the camera

17. Light Meter Most modern cameras have a built it light meter
It is used to measure the amount of light
Information from the light meter can be presented to you to help you take a photo
Or the camera can use the light meter information to set the camera for automatic or semi automatic taking of photos

18. Digital Camera Modes Fully automatic (Auto)
Partially automatic (Program,Tv Av )
Fully Manual (M)
Some digital camers do not allow some partial automatic and fully manual modes

19. Fully automatic (Auto)
The camera controls:
Flash, Aperture, Shutter ISO and Focus
You control: zoom, what photo you take and when you take it
The camera uses it light meter and processor to calculate the Aperture, shutter, ISO, Focus and flash

20. Semi Automatic - Program
The camera controls:
Aperture, Shutter and ISO
You control – In addition to, for Fully Auto Mode:
Flash and optionally Focus and ISO
The camera uses it light meter and processor to calculate the Aperture and shutter

21. Semi Automatic - Tv Mode
Also know as Sutter priority
The camera controls:
Aperture and optionally ISO
You control – In addition to, for Fully Auto Mode:
Flash, Shutter and optionally Focus and ISO
The camera uses it light meter and processor to calculate Aperture

22. Semi Automatic Av Mode Also know as Aperture priority
The camera controls:
Shutter and optionally ISO
You control – In addition to, for Fully Auto Mode:
Flash, Aperture and optionally Focus and ISO
The camera uses it light meter and processor to calculate Shutter speed

23. Fully Manual Mode The camera controls: Optionally only ISO
You control – In addition to, for Fully Auto Mode:
Flash, Aperture, Sutter speed and optionally Focus and ISO
The camera uses it light meter and processor to calculate Shutter speed and Aperture

24. When to use which modes
Fully Automatic Mode will give you good photos most of the time, but it limits creativity
With Semi automatic and manual modes you can get bad photos more often, if you don't know what you are doing, but you can be much more creative

25. When to use which modes
The best way to learn when to use which modes is to read about photograph in books or web pages and to experiment
Different camera models have different ways of selecting modes
Remember this workshop is about using the technology of digital camers Not about photography.