Sony A58 has a
20.0MP APS-C (23.2 x 15.4 m ) sized CMOS sensor . On the other hand, Pentax K-50 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 A58 and K-50 sensor size comparison.
Sony A58 and Pentax K-50 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 A58 and Pentax K-50 sensors have been tested by DxO and the results show that K-50 has a better overall score of 79, 5 points higher compared to A58's score of 74.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A58 |
74 |
23.3 bits |
12.5 Evs |
753 ISO |
Pentax K-50 |
79 |
23.7 bits |
13.0 Evs |
1120 ISO |