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Old Jul 8, 2007, 1:59 PM   #1
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I can not find the ISO setting in any of the EXIF data on my old photos by using Photoshop or Opanda Power EXIF reader. The only way I can find the ISO is to reload the picture back onto my Nikon D50. I must be missing something. Opanda Power EXIF 1.2 seems to show every possible camera setting except ISO.


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Old Jul 8, 2007, 8:12 PM   #2
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Nikon hides it in one of the tags in the Makernotes section, versus putting it in the standard EXIF tags.

So, most editors won't know how to read it (since the Makernotes are not documented by the camera manufacturers).

I can see it OK using digiKam (an open source image management application for Linux). But, I'm not sure what viewers and editors can decode it in Windows.

For example, here are digiKam decoded maker notes for one of the D50 sample images from the D50 review here (ISO 400 sample image).

File name: DSC_0005.JPG (MakerNote EXIF Tags)

>>> Nikon3 <<<

AFFocusPos : Single area; Center used
Bracketing : Delay
ColorBalance2 : 48 50 48 53 132 20 147 255 90 166 225 9 33 40 30 3 215 154 77 16 124 252 107 199 18 198 124 149 153 145 118 75 15 194 100 245 11...
ColorMode : MODE3a
ExposureBracketComp : 0/1
ExposureDiff : 0 1 12 0
FlashBracketComp : 0.0 EV
FlashComp : 0.0 EV
FlashMode :
FlashSetting : NORMAL
FlashType : Not used
Focus : AF-A
HueAdjustment : 0
ImageBoundry : 0 0 3008 2000
ImageOptimization : NORMAL
ISOSetting : 400
ISOSpeed : 400
Lens : 18-55mm F3.5-5.6
LensData : 48 50 48 49 144 45 150 255 9 242 172 133 97 5 77 47 235 20 118 248 20 225 12 68 19 78 123 146 157 145 115
LensFStops : 5.33333
LensType : 6
LightingType : NATURAL
NoiseReduction : OFF
Quality : FINE
Saturation : NORMAL
SensorPixelSize : 78/10 78/10
SerialNumber :
Sharpening : AUTO
ShutterCount : 7
ThumbOffset : 1662
ToneComp : AUTO
VariProgram :
Version : 48 50 49 48
WhiteBalance : AUTO
WhiteBalanceBias : 0


Yet, the ISO speed is not populated in the standard EXIF tags:

File name: DSC_0005.JPG (Standard EXIF Tags)

>>> Photograph Information <<<

CFA Pattern : 0 2 0 2 2 1 1 0
Color Space : sRGB
ComponentsConfiguration : YCbCr
Compressed Bits per Pixel : 4
Contrast : Normal
Custom Rendered : Normal process
Date and Time (digitized) : 2005:07:15 11:36:02
Date and Time (original) : 2005:07:15 11:36:02
Digital Zoom Ratio : 1.0
Exif Version : 48 50 50 49
Exposure Bias : 0
Exposure Mode : Auto
ExposureProgram : Aperture priority
Exposure Time : 1/8 s
FNumber : F6.3
File Source : Digital still camera
Flash : No flash
FlashPixVersion : 48 49 48 48
Focal Length : 45.0 mm
Focal Length In 35mm Film : 67.0 mm
Gain Control : None
InteroperabilityIFDPointer : 31548
Light Source : Unknown
MaxApertureValue : F5.3
Metering Mode : Multi-segment
PixelXDimension : 3008
PixelYDimension : 2000
Saturation : Normal
Scene Capture Type : Standard
Scene Type : Directly photographed
Sensing Method : One-chip color area
Sharpness : Normal
SubsecTime : 10
SubSecTimeDigitized : 10
SubSecTimeOriginal : 10
Subject Distance Range : Unknown
User Comment :
White Balance : Auto


>>> Image Information <<<

Date and Time : 2005:07:15 11:36:02
ExifIFDPointer : 216
Manufacturer : NIKON CORPORATION
Model : NIKON D50
Orientation : top, left
Resolution Unit : inch
Software : Ver.1.00
x-Resolution : 300
YCbCr Positioning : Co-sited
y-Resolution : 300


>>> Embedded Thumbnail <<<

Compression : JPEG (old-style)
JPEG Interchange Format : 0
JPEG Interchange Format Length : 9098
Resolution Unit : inch
x-Resolution : 300
YCbCr Positioning : Co-sited
y-Resolution : 300


>>> Interoperability <<<

InteroperabilityIndex : R98
InteroperabilityVersion : 48 49 48 48

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Old Jul 9, 2007, 8:20 AM   #3
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Thanks.




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Old Jul 9, 2007, 8:37 AM   #4
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This may help. It's a post made by the author of a utility that was designed to read the ISO speed from the Makernotes and populate the standard EXIF tag correctly.

It was designed for D70 files. So, I don't know if it would work on files from a D50 or not, since the byte offsets may have changed and/or Nikon may be doing it differently with the D50 (and I'd make sure to work with backups in case it messes them up).

http://forums.dpreview.com/forums/re...ssage=19629396

I also found some posts indicating that newer versions of Picasa can display the ISO speed OK from D50 files now (so, they must have figured out how to decode the makernotes tag for it).


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Old Jul 9, 2007, 8:52 AM   #5
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P.S.

I'd also complain to Nikon. IMO, something like ISO speed should not be hidden in the proprietary Makernotes.

They've been doing a bit too much off this kind of thing from my perspective (apparently, trying to obscure the data in image files to stifle competition for image related software). For example, Nikon encrypts metadata related to the "as shot" white balance in .nef files from most newer models (they started that with the D2x, then the D2Hs, and it's still continuing with newer cameras).

It's not just Nikon (other manufacturers have been guilty of this kind of thing, too). What is really needed is for camera manufacturers to document their image formats so that third party software providers can use the documentation to properly interpret the image data.

It's an even bigger issue with raw files. You can read more about it here:

http://www.openraw.org

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Old Jul 9, 2007, 4:45 PM   #6
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I think I may already have Picasa installed. It was downloaded along with something else from Google. I will try it.


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