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Fuji's ISO is highly inflated

Started Jan 22, 2013 | Discussions thread
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Den Sh
Junior MemberPosts: 44
Fuji's ISO is highly inflated
Jan 22, 2013

"""The true ISO value is considerably lower than the displayed value. I have performed some tests in comparison with the Canon EOS 5D Mark III, whose metering works particularly accurate according to
dpreview.com. When the X-E1 is set to the same aperture and ISO values, the camera determines a much longer exposure time than the Canon. The extension factor was in average 1.75 (with variations from 1.62 to 2.0), which is equal to three quarter exposure stops (EV).
There are reproducible differences between the various ISO levels. The lower values from ISO 200 to 1600 are too weak by about two third exposure levels (EV) on average. The two highest values (ISO 3200 and 6400), however, deviate by one full exposure value (EV).
This means for example, that the X-E1 works with a real ISO 125 when set to ISO 200 and a real ISO 3200 when set to ISO 6400. This will provide for very good noise performance results in comparative tests in magazines or websites. In reality, however, the noise performance of the X-E1 is actually good but not as phenomenal as it seems. The Fuji always has to select almost double the ISO value compared to properly tuned cameras for a given scene, aperture and shutter speed (*)."""

This directly corresponds to my experience with my X-E1. Although high ISO performance is great It's not the same ISO light-wise. This means that you should compare Fuji's image quality at ISO 6400 to about 3200-4000 of Canon/Nikon's.

Canon EOS 5D Mark III Fujifilm X-E1
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