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, Pentax K-500 has a
16.0MP APS-C (23.7 x 15.7 mm ) sized CMOS sensor and features PRIME M processor.
Below you can see the A33 and K-500 sensor size comparison.
Sony A33 and Pentax K-500 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the same focal length and aperture.
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 Pentax K-500 sensors have been tested by DxO and the results show that K-500 has a better overall score of 79, 9 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 |
Pentax K-500 |
79 |
23.7 bits |
13.1 Evs |
1087 ISO |