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

2. Co"Correct” Exposure Theoretically, to get a correctly exposed image means that the exact amount of light needs to enter the camera, no more no less !

3. Co"Correct” Exposure The correct exposure is whatever is needed for the Photographer to get the effect he or she desires. That might be technical perfection, but it might also be deliberate over- or underexposure used to get specific artistic effects

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

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

6. 3 major factors in creating an exposure ISO Aperture Shutter Speed If you adjust one, the others will need adjusting The Exposure Triangle

7. THE EXPOSURE TRIANGLE

8. ISO International Standards Organization

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

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

11. The Camera Sensor

12. Camera ISO Range Typical Camera ISO range Nikon D3300 - 100 - 12800 ISO Nikon D7000 - 100 - 6400 ISO Nikon D7200 - 100 - 25600 ISO Canon 1200D - 100 - 6400 ISO Canon 700D - 100 - 12800 ISO Canon 5D - 100 - 25600 ISO (102400)

13. 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.

14. 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. ISO

15. 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 1600+ ISO for really low light situations

16. Deliberate High ISO

17. THE EXPOSURE TRIANGLE

18. Aperture

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

21. Depth Of Field

22. THE EXPOSURE TRIANGLE

23. Shutter Speed

24. Shutter Speeds

25. Camera Shutter How does it work ?

27. Aperture / Shutter Speed Relationship

28. Aperture / Speed Relationship

30. Taking The Picture

31. 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.

32. 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)

34. 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 than your technical prowess”