The Mechanics Behind the Lens


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  • This was made as a training presentation for staff photographers with the purpose to make photos and files usable for non designers. Normally all photos I shoot are in raw format, but these files are not suitable for sharing with other staff.
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The Mechanics Behind the Lens

  1. 1. The Mechanics Behind the Lens
  2. 2. The Exposure Triangle Aperture Shutter Speed ISO sensitivity
  3. 3. ISO Aperture Shutter Speed ISO sensitivity
  4. 4. Aperture & Shutter Speed Work together during a capture to control the amount of light entering the camera to obtain a properly exposed picture
  5. 5. at f/5.6 Shutter Speed 1/500 1/250 1/125 1/60 1/30 F/stop f/2.8 f/4 f/5.6 f/8 f/11 at 1/125 sec.
  6. 6. Aperture Mechanical opening that regulates how much light enters the camera through the lens.
  7. 7. Aperture The physical opening of the camera lens Called F-Stop Higher the “F” number the smaller the opening F/22 small F/1.2 big
  8. 8. Aperture Controls Depth of Field(DOF) F/18 DOF how much is in focus front to back. F/22 large DOF F/1.2 very small DOF F/5.6
  9. 9. Aperture Shallow DOF Allows you to isolate a subject from a distracting background taking the subject out of context
  10. 10. Aperture Long DOF Allows you to show the background or foreground to place your subject into context of what is in the surrounding area
  11. 11. Shutter Speed The time duration that the sensor can record light Measured in seconds 1/1000 fast 1/25 slow 2 very slow
  12. 12. Shutter Speed Controls motion Fast = Freeze Slow = Blur Speeds slower than 1/30 are subject to camera shake.
  13. 13. Shutter Speed Control camera shake by: Holding properly Bracing Using a support Finding more light to allow a faster shutter speed
  14. 14. Aperture and Shutter Speed Are inversely proportional Each have trade offs
  15. 15. Aperture and Shutter Speed Low f/stop means more light and a faster shutter but less DOF Slow shutter means more light and higher f/stop but can cause motion to blur
  16. 16. Aperture & Shutter Speed Automatic Setting Camera Adjusts to Best Exposure Can Be Modified for Specific Situations Sport Night Portrait Manual Adjustment
  17. 17. ISO Increases the sensitivity of the sensor. Faster shutter speeds Smaller apertures Trade off - NOISE
  18. 18. Picture Quality & File Size
  19. 19. Quality Image Quality refers to how much compression is applied to the photo to save on storage space. Use HIGHEST Low Quality Best Quality QUALITY ** Not all cameras have this setting
  20. 20. Image Size Refers to how many pixels wide by high the actual capture. 3872x2592 (FINE)* 2896x1944 (NORM)* 1936x1296 (BASIC)* Turns down the megapixels *Nikon D80 10.2mpx camera
  21. 21. Quality x Size = File Size Assume a 2gb card at highest quality File size Qty stored 4.8 mb ~ 266 fine 2.7 mb ~ 466 norm 1.2 mb ~ 503 basic
  22. 22. Shoot in Fine or Normal Format Your photo could end up on a poster, or the web, or a large format banner Don't choose RAW format
  23. 23. Let's Look at the Equipment D80 CoolPix
  24. 24. D 80 DSLR 10.2 mpx Interchangeable lenses Faster shooting Requires some additional training
  25. 25. D 80 Power Shots Remaining Mode Selector
  26. 26. Cool Pix Point & Shoot 8mpx Wide angle lens Comparatively easy to use Lightweight
  27. 27. Cool Pix Tips Avoid using the flash. Use the self timer's 2 second delay to help prevent camera shake in low light. Keep an extra set of batteries on hand (2 AA)
  28. 28. Cool Pix OK-Mode Menu Power
  29. 29. ?