Sony A300 has a 10.0MP APS-C (23.6 x 15.8 mm ) sized CCD sensor . You can shoot at maximum resolution of 3872 x 2592 pixels. A300 has a native ISO range of 100 - 3200 and it can save files in RAW format which gives you a wider room for post processing.
Sony A300 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 A300 vs Fujifilm X-E5 or take a look at Highest resolution DSLR cameras list.
Sony A300 DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. Sony A300 sensor has been tested by DxO Mark and got an overall score of 64 for its image quality. You can find the details of their analysis of Sony A300 here.
Let's look at how the size of the Sony A300's APS-C sensor compares with other standard sensor sizes.
Comparison image of Sony A300 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Sony A300 gives you at any given aperture.
You can
calculate
the exact depth of field for the Sony A300
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.
