Sony A33 has a
14.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Bionz processor. On the other hand, Sony A65 has a
24.0MP APS-C (23.5 x 15.6 mm ) sized CMOS sensor and features Bionz processor.
Sony A65's sensor provides 10MP more than Sony A33's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Below you can see the A33 and A65 sensor size comparison.
Sony A33 and Sony A65 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Sony A33 has 71% larger pixel area compared to Sony A65, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.
DxOMark Sensor Scores
DxOMark is a benchmark that scientifically assesses image quality of camera sensors. It scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Sony A33 and Sony A65 sensors have been tested by DxO and the results show that A65 has a better overall score of 74, 4 points higher compared to A33's score of 70.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A33 |
70 |
22.8 bits |
12.6 Evs |
591 ISO |
Sony A65 |
74 |
23.4 bits |
12.6 Evs |
717 ISO |