Both Fujifilm X10 and Fujifilm X100 have 12.0 MP resolution sensors but Fujifilm X10's sensor is 2/3-inch (8.8 x 6.6 mm ) and Fujifilm X100's sensor is APS-C (23.6 x 15.8 mm ).
Since Fujifilm X100's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Fujifilm X10.
One other difference between these two cameras that is worth mentioning is that Fujifilm X100's sensor doesn't have an anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the X10 and X100 sensor size comparison.
As seen above, Fujifilm X100 has a 6.4x Larger sensor area than Fujifilm X10. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.
DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Fujifilm X10 and Fujifilm X100 sensors have been tested by DxO and the results show that X100 has a better overall score of 73, 23 points higher compared to X10's score of 50.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Fujifilm X10 |
50 |
20.5 bits |
11.3 Evs |
245 ISO |
Fujifilm X100 |
73 |
22.9 bits |
12.4 Evs |
1001 ISO |