1. CASTLEFORD CAMERA CLUB
DSLR Introduction-Session 1
The Exposure Triangle

2. Co"Correct” Exposure
May be defined as an exposure that achieves the effect the photographer intended

3. “Correct Exposure” as determined by the camera
“Underexposed” – but achieving the picture the photographer wanted

4. “Overexposed” to achieve the effect the photographer wanted

5. 3 major factors in creating an exposure
ISO
Aperture
Shutter Speed
If you adjust one, the others will need adjusting
The Exposure Triangle

6. THE EXPOSURE TRIANGLE

7. ISO
International Standards Organization

8. Choosing the film sensitivity was one of the many factors photographers had to consider when using film in their cameras

9. ISO
Since digital cameras do not use film but use image sensors instead, the ISO equivalent is usually given.

10. The Camera Sensor

11. ISO
The important thing to understand, is that each step between the numbers effectively doubles the sensitivity of the sensor. So, ISO 200 is twice more sensitive than ISO 100, while ISO 400 is twice more sensitive than ISO 200.
ISO 1600 is sixteen times more sensitive to light than ISO 100, so on and so forth.

12. ISO
The downside to having a high ISO is that we lose clarity in our images.
Increasing the ISO tends to mean the resulting photographs get more grain/noise.

13. Typical ISO Settings
100 or 200 ISO for sunny and bright daylight 400 ISO for cloudy days, or indoors for window light portraits 800 ISO for indoors without a flash ISO for really low light situations

14. THE EXPOSURE TRIANGLE

15. Aperture

16. The aperture is made up of a number of interlocking diaphragm blades that open to allow the light into the camera.

18. Depth Of Field

19. THE EXPOSURE TRIANGLE

20. Shutter Speed

21. Shutter Speeds

22. Shutter speeds are measured in fractions of seconds e. g
Shutter speeds are measured in fractions of seconds e.g. 1/60 of a second or 1/2500 of a second.

23. Aperture / Shutter Speed Relationship

24. Aperture / Speed Relationship

25. Aperture / Speed Relationship

26. Taking The Picture

27. The first thing you need to determine is the type of effect you want from your image:
Depth of field
Frozen action shot
Motion blur
Once this has been determined you can either set your Aperture or Shutter speed and then adjust the other to produce the intended exposure.

28. BRINGING IT ALL TOGETHER
Aperture: Small F number = big hole in lens  = more light into the camera
Shutter Speed: Slower shutter speed = more light into the camera
ISO: Higher number = more sensitivity (but may be grainy)

29. Final Thought !
Remember –if at first, you are getting a bit confused or you are still trying to master your camera “ Its a million times better that someone be amazed by your photographs then your technical prowess”