1 / 45

Digital Photography: An Introduction to Exposure

Digital Photography: An Introduction to Exposure. The Exposure Triangle. Exposure. Exposure is the total amount of light that you allow into the camera. Exposure Triangle. ISO. Changing any of the three elements will effect the exposure. Shutter Speed. Aperture.

pollyw
Télécharger la présentation

Digital Photography: An Introduction to Exposure

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Digital Photography: An Introduction to Exposure

  2. The Exposure Triangle

  3. Exposure Exposure is the total amount of light that you allow into the camera

  4. Exposure Triangle ISO Changing any of the three elements will effect the exposure Shutter Speed Aperture Aperture and shutter speed are inversely proportional to each other.

  5. Exposure Triangle http://www.flickr.com/photos/robert_d_ellis/5387408926/

  6. Camera Configuration Digital Sensor Shutter Aperture Lens

  7. Exposure Too much light results in an over-exposed image where there are areas of bright white or  ’blow-outs’.  These areas contain no detail or color. 

  8. Exposure Too little light results in an under-exposed image where there are areas of low detail.

  9. Exposure Great differences in light within a photograph confuses the camera. The camera exposes to the bright light , therefore the darker portions of the photograph are blacked out. Vatican, Rome

  10. SHUTTER SPEED

  11. Shutter Speed Posing for 19th century photographs Usually took as much a 5 minutes of Sitting perfectly still. Luckily, today we can control Shutter speeds. Opelika, AL

  12. Shutter Speed • Shutter Speed—the amount of time the shutter is open—which determines how much light is captured in the recording process • Measured in seconds: super fast 1/2000 second to 30 seconds • The slower the speed, the longer light can enter the camera. Appropriate for shooting pictures in darker situations; also great for freezing action and movement Shutter speeds and aperture (f-stops) are inversely proportional.

  13. Shutter Speed Action shots require fast shutter speeds. Callaway Gardens Steeple Chase

  14. Shutter Speed Shutter speed is measure in fractions of a second. A shutter speed greater than 1/60thsecond requires the use of a stabilizing device like a tripod. Without stabilization, the photograph will not be crisp and clear.

  15. Low Lightrequires longer shutter speeds and a tripod Full 1 second shutter speed Langdale Mill

  16. Low Lightrequires longer shutter speeds and a tripod

  17. Shutter Speed Must use A tripod Best for Sports shots

  18. ISO

  19. ISO • ISO is the measurement of how sensitive the image sensor in the camera is to light. • Measured in numbers 100, 200, 400, 800, etc. • Use a lower number when smooth crisp images are need and you have plenty of light. • Higher numbers are used when light is limited, you do not want to use a flash, or the subject is moving; may result in grainy images

  20. The Exposure TriangleISO – International Organization of Standardization ISO—the measurement of the sensitivity of the camera image sensor to light. Measured in numbers 100, 200, 400, 800, etc. • Lower numbers used when smooth crisp images are desired and you have plenty of light. • Higher numbers are used when light is limited, you do not want to use a flash, or the subject is moving; may result in grainy images

  21. ISO ISO is the measurement of the sensitivity of the camera image sensor to light. An ISO of around 200 is average.

  22. ISO An ISO of around 200 is average. Lower numbers are used when smooth crisp images are needed and you have plenty of light. Below 200

  23. ISO An ISO of around 200 is average. Lower numbers are used when smooth crisp images are needed and you have plenty of light. Below 200

  24. ISO Higher numbers are used in • limited light conditions, • Flash is not desirable • subject is moving • May result in grainy images 400 and above

  25. Choosing ISO Setting 100 to 200 -------Outside Bright Sun 400----Shade or overcast conditions 400----Bright light indoors 800-1400----Stormy day 800-1400 – Low light indoors

  26. Higher ISO400 ISO 800 ISO Light is limited and flash was not desirable in either shot.

  27. ISO Too little light can leave parts of your image too dark to make out details. If the ISO had been higher this photograph would have been brighter. Trevi Fountain, Rome ISO 200

  28. High ISO This photo taken with ISO 800. Notice the grainy appearance. This is called noise. Rome by night

  29. ISO 160 Notice the camera exposes to the light not the bride. More advanced cameras have a mechanism that will allow you to expose to individual areas with in the shot.

  30. APERTURE

  31. Aperturef-stops Aperture is the camera feature that regulates the amount of light that passes through the lens by controlling the size of the opening in the lens. It is measured in f/stops.

  32. Aperturef-stops Aperture is the camera feature that regulates the amount of light that passes through the lens by controlling the size of the opening in the lens. Described as the f/stop the smaller the number the wider the lens will open Stopping down

  33. Aperturef-stops The common range for f-stops goes from f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22 Narrow depth of field f/8 is a good average aperture where Most everything will be in focus. Infinite depth of field

  34. F/stops and depth of field Lower f stops need less light to expose Higher f stops need more light to expose Depth of Field decreases Depth of Field increases f/2 F /22 f/8

  35. Aperturef-stops Full f-stops go from f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11, f/16, f/22, f/32 Each full stop value increase, decreases the light entering the camera by half. Fast lens Slow lens Longer shutter speed Shorter shutter speed Large depth of field Narrow depth of field

  36. Aperture Narrower Depth of Field More exposed Greater Depth of field Longer Shutter Speeds

  37. Shutter Aperture Relationship The smaller the aperture, the longer the shutter speed The larger the aperture, the shorter the shutter speed.

  38. Sunny Sixteen Rule The "rule of sunny-16" is simply a handy trick to remember away to set proper exposure when the sun is high in the sky And casts strong shadow on a bright day. The camera aperture is set to f/16 (hence the -16 in sunny-16). dark shadows. The sunny sixteen rule was NOT used in this photoghraph.

  39. Sunny Sixteen Rule Aperture Stops Conditions

  40. Issues with each exposure point ISO Noise Changing any of the three elements will effect the exposure Shutter Speed Aperture Motion Blur Depth of Field Aperture and shutter speed are inversely proportional to each other.

  41. MANUAL SETTINGS

  42. Manual exposure mode In M mode, the aperture and the shutter speed can be altered. By turning the main dial on your camera, you can adjust the shutter speed. The aperture remains the same.

  43. Manual exposure mode In the Canon Rebel Set the Tv by turning the dial Set the Av by holding down the Av button while turning the dial.

  44. Manual exposure mode In the Canon Rebel Set the Tv by turning the dial Set the Av by holding down the Av button while turning the dial. The standard exposure level is achieved when the slide bar is located in the center. This meter may be viewed on the LCD screen or through the view finder

  45. AE LockConsult your camera manual for AE lock steps Exposed to a chosen darker subject in the photo ( AE lock) Exposed to the light (normal )

More Related