Fujifilm X-S1 has a 12.0MP 2/3-inch (8.8 x 6.6 mm ) sized EXRCMOS sensor and features EXR processor. You can shoot at maximum resolution of 4000 x 3000 pixels with aspect ratios of 1:1, 4:3, 3:2 and 16:9. X-S1 has a native ISO range of 100 - 3200 which can be boosted to 12800 and it can save files in RAW format which gives you a wider room for post processing.
Fujifilm X-S1 is not the highest resolution Small Sensor camera. Canon SX740 HS with its 21.0MP sensor is leading in this class. Check the comparison of Fujifilm X-S1 vs Canon SX740 HS or take a look at Highest resolution Bridge cameras list.
Fujifilm X-S1 DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. Fujifilm X-S1 sensor has been tested by DxO Mark and got an overall score of 49 for its image quality. You can find the details of their analysis of Fujifilm X-S1 here.
Let's look at how the size of the Fujifilm X-S1's 2/3-inch sensor compares with other standard sensor sizes.
Comparison image of Fujifilm X-S1 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Fujifilm X-S1 gives you at any given aperture.
You can
calculate
the exact depth of field for the Fujifilm X-S1
at any focal length, aperture and subject distance, including the hyperfocal distance
for landscapes and how close you can get before the focus zone becomes too thin.
