Canon 7D has a 18.0MP APS-C (22.3 x 14.9 mm ) sized CMOS sensor and features Dual Digic 4 processor. You can shoot at maximum resolution of 5184 x 3456 pixels with aspect ratios of and 3:2. 7D has a native ISO range of 100 - 6400 which can be boosted to 12800 and it can save files in RAW format which gives you a wider room for post processing.
Canon 7D is not the highest resolution APS-C camera. Fujifilm X-E5 with its 40.0MP sensor is leading in this class. Check the comparison of Canon 7D vs Fujifilm X-E5 or take a look at Highest resolution DSLR cameras list.
Canon 7D DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. Canon 7D sensor has been tested by DxO Mark and got an overall score of 66 for its image quality. You can find the details of their analysis of Canon 7D here.
Let's look at how the size of the Canon 7D's APS-C sensor compares with other standard sensor sizes.
Comparison image of Canon 7D Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Canon 7D gives you at any given aperture.
You can
calculate
the exact depth of field for the Canon 7D
at any focal length, aperture and subject distance, including the hyperfocal distance
for landscapes and the very shallow focus zone you get with long telephoto lenses.
