Both Nikon D5200 and Sony A77 II have 24.0 MP resolution sensors but Nikon D5200's sensor is APS-C (23.5 x 15.6 mm ) and Sony A77 II's sensor is APS-C (23.5 x 15.6 mm ).
Since Sony A77 II'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 Nikon D5200.
Below you can see the D5200 and A77 II sensor size comparison.
Nikon D5200 and Sony A77 II 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 Nikon D5200 and Sony A77 II 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, D5200 has scored 84, 2 points higher than A77 II.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Nikon D5200 |
84 |
24.2 bits |
13.9 Evs |
1284 ISO |
Sony A77 II |
82 |
24.4 bits |
13.4 Evs |
1013 ISO |