Sony A65 has a 24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Bionz processor. You can shoot at maximum resolution of 6000 x 4000 pixels with aspect ratios of 3:2 and 16:9. A65 has a native ISO range of 100 - 12800 which can be boosted to 25600 and it can save files in RAW format which gives you a wider room for post processing.
Sony A65 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 Sony A65 vs Fujifilm X-E5 or take a look at Highest resolution DSLR cameras list.
Sony A65 DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. Sony A65 sensor has been tested by DxO Mark and got an overall score of 74 for its image quality. You can find the details of their analysis of Sony A65 here.
Let's look at how the size of the Sony A65's APS-C sensor compares with other standard sensor sizes.
Comparison image of Sony A65 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Sony A65 gives you at any given aperture.
You can
calculate
the exact depth of field for the Sony A65
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.
