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Old Aug 20, 2006, 9:01 PM   #11
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The concept of image stablization, shake reduction or whatever the term is, is pretty straight forward. It is very similiar to the noise cancelation in stero headphones. You sense something then, create an equal and opposit, add the two together and it sums to 0 or something near 0.

In the case of the headphones, it measures a loud noise, then produces a equal but opposit noise, your ear hears both, adding them together and thus you actually hear quite or something next to quite.

In the camera, you have a tiny gyroscope that measures movement in up/down, left/right, in/out, and around each axis. Then the assembly holding the CCD (the film) is adjusted in the opposit direction from the sensed motion, thus negating or counteracting it. If this is done while the sensor is being exposed to light, it mitigates the movement.

This is very similiar to you holding a drink in hand while walking across a rolling and pitching deck of a ship, you adjust the glass so as to keep the water from spilling out of it. Same thing.
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Old Aug 20, 2006, 9:24 PM   #12
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Good description - that's how I understand it works, also. And my experience has been like yours - the system really DOES make a big difference when it comes to camera shake. It also explains why it doesn't make a difference with moving subjects - it measures the movement of the camera, not of the soaring hawk you are trying to take a picture of.
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Old Aug 20, 2006, 9:41 PM   #13
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Here is another set of images that I took at the same time. What I tried to do is to use a long lense so as to amplify the movement of the camera on a item a long distance away, thus making what ever movement pretty noticeable. Initially, I was amazed at how difficult it was to hold the camera steady.

So here are the particulars

Shaking

Tag Name Value
010f Make PENTAX Corporation
0110 Model PENTAX K100D
0112 Orientation 1
011a XResolution 72.0
011b YResolution 72.0
0128 ResolutionUnit 2
0131 Software K100D Ver 1.00
0132 DateTime 2006:08:19 19:49:32
829a ExposureTime 1/20
829d FNumber 5.8
8822 ExposureProgram 2
8827 ISOSpeedRatings 800
9101 ComponentsConfiguration 0x1 0x2 0x3 0x0
9204 ExposureBiasValue 0.0
9207 MeteringMode 5
9209 Flash 16
920a FocalLength 300.0
a000 FlashPixVersion 0x30 0x31 0x30 0x30
a002 ExifImageWidth 3008
a003 ExifImageLength 2000




UnShoken

Tag Name Value
010f Make PENTAX Corporation
0110 Model PENTAX K100D
0112 Orientation 1
011a XResolution 72.0
011b YResolution 72.0
0128 ResolutionUnit 2
0131 Software K100D Ver 1.00
0132 DateTime 2006:08:19 19:49:25
829a ExposureTime 1/30
829d FNumber 5.8
8822 ExposureProgram 2
8827 ISOSpeedRatings 800
9101 ComponentsConfiguration 0x1 0x2 0x3 0x0
9204 ExposureBiasValue 0.0
9207 MeteringMode 5
9209 Flash 16
920a FocalLength 300.0
a000 FlashPixVersion 0x30 0x31 0x30 0x30
a001 ColorSpace 1
a002 ExifImageWidth 3008
a003 ExifImageLength 2000
a005 InteroperabilityOffset 52242
0001 InteroperabilityIndex R98
0002 InteroperabilityVersion 0x30 0x31 0x30 0x30
a217 SensingMethod 2




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Old Aug 20, 2006, 9:44 PM   #14
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[img]file:///C:/Documents%20and%20Settings/Gordon/Desktop/shake.jpg[/img]

[img]file:///C:/Documents%20and%20Settings/Gordon/Desktop/unshake.jpg[/img]
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Old Aug 20, 2006, 9:57 PM   #15
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Forgot to add - same setup as the initial post,
  • same camera[/*]
  • same lense - the 100 - 300mm Pentax zoom[/*]
  • same cameraman[/*]
The target that I am shooting is right above the red floor sign in the initial image - the little speck of blue - dead center of the frame. It was about 100 feet away.
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