Both Sony A68 and Sony A77 have 24.0 MP resolution sensors but Sony A68's sensor is APS-C (23.5 x 15.6 mm ) and Sony A77's sensor is APS-C (23.5 x 15.6 mm ).
Since Sony A77's has a larger sensor area with the same resolution, this means that it also has a larger pixel area hence better light collecting capacity for a given aperture compared to Sony A68.
Below you can see the A68 and A77 sensor size comparison.
Sony A68 and Sony A77 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.
DxOMark Sensor Scores
Both Sony A68 and Sony A77 sensors have been tested by DxoMark. DxoMark 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. Of the two cameras that we are comparing, A68 has scored 79, 1 points higher than A77.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A68 |
79 |
24.1 bits |
13.5 Evs |
701 ISO |
Sony A77 |
78 |
24.0 bits |
13.2 Evs |
801 ISO |