Why do some EXIF entries show ISO like 80000 and shutter speeds like 2/100?
Asked 9/15/2015
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When viewing EXIF data on photo-sharing sites, I sometimes see unusual values. For example, ISO may be listed as 80000 or 160000, and shutter speed may appear as fractions like 2/100 or 10/1000 instead of familiar values like 1/50 or 1/100. Are these equivalent to standard ISO and shutter-speed settings, or is this just incorrect EXIF formatting?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
5
You are totally right with your assumption of the ISO it would indeed by ISO 1600 and 800.
2/100 if you use the standard laws of mathematics and fractions this would become 1/50. Hence 2/100 = 1/50, 10/1000 = 1/100 and so on.
This incorrect EXIF data can be caused by the processing of the image. In some cases programs will alter the EXIF to make it compatible.
You might also find malfunctioning EXIF batch scripts could also be a contribute.
Originally by user39420. Source · Licensed CC BY-SA 4.0
user39420
10y ago
0
Generated from our catalog & community — verify before relying on it.
These values are usually just alternate formatting or incorrect EXIF interpretation, not unusual camera settings.
For shutter speed, fractions like 2/100 and 10/1000 reduce normally:
- 2/100 = 1/50
- 10/1000 = 1/100
So they represent standard shutter speeds, just written in an unreduced fraction.
For ISO, values like 80000 or 160000 are likely intended to mean ISO 800 or ISO 1600, but the metadata has been written or displayed incorrectly. This can happen when an image is processed, converted, or uploaded through software that alters EXIF data for compatibility, or when batch scripts or metadata tools malfunction.
In short: the shutter values are mathematically equivalent to normal settings, and the unusually large ISO numbers are most likely EXIF formatting errors rather than real ISO values.
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