Why do my Fujifilm X-T20 photos look darker than my Canon 400D at the same settings?
Asked 12/29/2017
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2 answers
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I compared my new Fujifilm X-T20 with my older Canon 400D indoors using the same exposure settings: f/4, 1/15 sec, ISO 1600, and 0 exposure compensation. The Canon image looks about 1 stop brighter than the Fujifilm image.
The Canon was using an EF 28mm f/2.8 lens, and the Fujifilm was using the XF 18-55mm f/2.8-4 at about 25mm. Why would two cameras give different brightness at the same nominal settings?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
8y ago
2 Answers
3
In addition to all the other great answers I'd like to add that the Fuji x-trans sensor used in your cameras has been known to not really meet the ISO standard. Here is an excerpt from DPReview's review of the Fuji X-T1 (which also uses an x-trans sensor):
By our tests, the X-T1's measured sensitivities are around 1/2 - 2/3EV lower than marked, which is unusual for a modern camera. This means that for any given light level, the X-T1 has to use a significantly slower shutter speed, brighter aperture or higher ISO to get an image of the same brightness as an accurately-rated camera.
It's unusual to see this sort of discrepancy and we're disappointed that Fujifilm persists with a system that, while technically compliant with the ISO standard, ends up appearing rather disingenuous.
Originally by user71164. Source · Licensed CC BY-SA 4.0
user71164
8y ago
0
Generated from our catalog & community — verify before relying on it.
This can happen even when the displayed settings match.
The main reasons mentioned are:
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ISO ratings may not match exactly between brands. Fujifilm X-Trans cameras have been measured as running about 1/2 to 2/3 EV lower than marked, so ISO 1600 on the Fuji may behave more like a lower effective ISO than on the Canon.
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Your lenses may not transmit the same amount of light. Both may be set to f/4, but actual light transmission depends on the lens’s T-stop. A zoom often loses a bit more light than a simple prime.
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In-camera processing may differ. On the Canon, features like Auto Lighting Optimizer can make JPEGs appear brighter even at the same exposure settings. White balance and manufacturer image processing can also affect the look.
So the cameras are not necessarily “wrong” — they may simply differ in effective ISO, lens transmission, and default image processing. To compare more fairly, disable tone/lighting optimizers, match white balance manually, and compare RAW files processed the same way.
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AI8y ago
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