Digital photography basics for J31 class at Drake University, Fall 2010.

1. Digital photography
AUG. 27, 2010 | JMC31

3. Choosing a digital camera
What will you do with your images?
What size prints do you want to make?
How much money do you want to spend?
How “big” of a camera do you want?

13. What to look for when buying
Resolution (?MP)
Image stabilization
Zoom (optical /digital); wide angle
Video (HD, 720p, 1080i)
Storage (compact flash, SD card, etc.)
LCD screen size

14. Know your resolution
1MP - low quality, good for screen-based images
2MP - mid-quality for computer and small prints (4x6)
3MP - good quality for color prints (8x10)
4MP - very good quality (11x14 prints)
5+MP - excellent quality (cropping photos)

15. Pixels and megapixels
Pixel = Picture (pix) elements (els)
Mega = million
Megapixel (MP) = million pixels
A pixel is a very small light-sensitive area
More pixels = better quality = more money

18. What resolution to use
Shoot at the highest resolution you will need, and consider
if you will be cropping.
More realistically: if you’ve got the memory, shoot at the
highest resolution you can. You can always make images
smaller, but never bigger.

19. Resolution and megapixels
2400 xx1800 = .3MP
1600 x1200 = 1.9MP
640 480 4.3MP

20. 3072x2304 or L

21. 2048x1536 or M2

22. 1600x1200 or M3

23. 640x480 or S

24. Pixels and printing
Web site: 450x350 pixels (.25-.50 MP)
4x6 print: 1200x1800 pixels (1.5-2.5 MP)
8x10 print: 2000x2500 pixels (4-5 MP)
12x16 print: 2400x3200 pixels (6+ MP)

25. Flash
Generally works from a distance of 1 to 12 feet
Default — Auto Flash
Red-eye reduction
Forced flash
Night flash mode
No flash

26. Forced flash

27. Reducing red eye

28. Reducing red-eye
Get the flash away from the lens
Bounce the flash off the ceiling
Turn on room lights (lets pupils contract)
Use red-eye reduction flash
Have subject look slightly away from camera
Move camera closer
Don’t use flash

29. Zoom
Optical = good
Digital = bad
Try to find a camera with at least 4x optical zoom
(and ignore digital zoom)

30. Macro mode
Allows you to shoot very close
Camera won’t normally focus that close

31. Memory/storage
Internal — very limited usage
Removable — Compact Flash, Memory Stick, Smart Media,
Secure Digital (SD), MiniSD, MicroSD, MultiMedia Card

32. Review
Resolution - shoot at high or low?
Flash - do you ever need in daylight?
Close-up - what is this mode called?
Storage - what’s an example of external memory?

33. Photography
Literally means “writing with light”
Light is the most important thing when taking photos

36. Three ways to control light
Aperture: how much light gets in
Shutter speed: how long light is let in
ISO: sensitivity of image device

37. Aperture
F-stop is the measurement of the opening
F1 is very wide opening letting in lots of light
F32 is a small opening letting in little light

38. Aperture
Your camera likely has F3.5-F8
A full F-stop change either doubles or halves the amount of
light coming into the camera
Involved in depth of field, which we will cover shortly

39. f 6.3

40. f 4.0

41. f 2.8

42. f 1.8

43. Shutter speed
Determines how long light comes in
1/15th of a second would be a long exposure letting
lots of light into the camera
1/2000 would be a short exposure, letting in very little light
Slow shutter speeds allow blurring of the subject
Fast shutter speeds stop the action

45. ISO
The sensitivity of light of a photosensitive surface
Film is measured in ISO, and most digital cameras
have this adjustment
Low ISO indicates low sensitivity to light, but generally
higher resolution with less “noise” or “grain”
A 100 ISO setting is twice as sensitive to light as a 50 ISO

46. 100 ISO

47. 200 ISO

48. 400 ISO

49. 800 ISO

50. 1600 ISO

51. Depth of field
How much of the photo is in focus
Controlled by...
Aperture
Subject’s distance from the camera
Focal length

52. DOF: Aperture
The more wide open the aperture, the less the depth of field

53. F11 aperture

54. F2.8 aperture

55. DOF: Distance from camera
The closer the subject, the less depth of field
The farther away, the more depth of field

58. Focal length
The greater the focal length (zoomed or telephoto),
the less the depth of field
Therefore, for the greatest depth of field you would need a
wide angle lens, with a closed aperture, and a subject at a
good distance

59. Using this information
Or, using it on YOUR camera

60. Auto mode
When you want to take a snapshot without worrying about
the mechanics of photography, leave the camera on Auto.
This mode sets all exposure levels automatically, and it
usually locks you out of making any minor adjustments
manually.

61. Program mode
Like auto mode on steroids, this mode automatically sets
aperture size and shutter speed for a perfect exposure — but
it also lets you tweak settings, giving you more creative
control. You can change white balance and exposure
compensation, for instance, and even nudge shutter speed
up or down a bit.

62. Aperture value
When you set the size of the aperture, and your camera
automatically provides the right shutter speed to deliver the
correct exposure. Rely on this mode to blur the background
or to keep the entire image in sharp focus (depth of field).

63. Time value
Shutter mode: This setting is your best option for taking
action photography. Shutter priority allows you to freeze the
scene or artistically blur the photo. All the while, the camera
keeps the exposure matched to the aperture.

64. Manual mode
This mode gives you total control. Exact opposite of Auto
mode. You use buttons on the camera’s body to set both
shutter speed and aperture size. But you are working with no
safety net. The camera won’t protect you from under- or
overexposed photos. Use the LED screen lots.

65. Landscape mode
Your camera picks the best aperture and shutter settings for
the greatest depth of field when taking photos of landscapes
and other outdoor photos.

66. Macro mode
To focus on extremely close subjects — within a few inches of
the lens — choose the tulip. You can take life-size photos of
insects, flowers and other small subjects in this mode. But the
focus range (depth of field) is very narrow.

67. Snow and sand
Brightly colored or glaring backgrounds can trick the camera
into underexposing the subject. This mode overexposes the
scene to gain details that would otherwise be lost.

68. Action
The action (or sports) mode sets the camera to the highest
possible shutter speed, increasing your odds of getting a
clear shot of people in motion.

69. Night
This mode lets you capture nighttime scenes by combining a
flash, which freezes people in the foreground, with a slow
shutter speed, which allows lights from buildings, cars and
other elements to show in the background.

70. < Flash
Night mode >

71. Portrait
This mode lets you capture portraits of people (or animals)
with lower depth of field so that the background should have
a soft focus.

72. File formats
JPG (JPEG)
RAW

73. RAW file format
Uncompressed
Not all manipulation programs support (Photoshop does)
On more expensive cameras

75. JPEG file format
Compressed
Almost all programs support
On all cameras
Lossy compression (so some data is lost)