Nikon P7100 has a 10.0MP 1/1.7-inch (7.44 x 5.58 mm ) sized CCD sensor and features Expeed C2 processor. You can shoot at maximum resolution of 3648 x 2736 pixels with aspect ratios of 1:1, 5:4, 4:3, 3:2 and 16:9. P7100 has a native ISO range of 100 - 3200 which can be boosted to 6400 and it can save files in RAW format which gives you a wider room for post processing.
Nikon P7100 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 Nikon P7100 vs Canon SX740 HS or take a look at Highest resolution Compact cameras list.
Nikon P7100 DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. Nikon P7100 sensor has been tested by DxO Mark and got an overall score of 41 for its image quality. You can find the details of their analysis of Nikon P7100 here.
Let's look at how the size of the Nikon P7100's 1/1.7-inch sensor compares with other standard sensor sizes.
Comparison image of Nikon P7100 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Nikon P7100 gives you at any given aperture.
You can
calculate
the exact depth of field for the Nikon P7100
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.