Both Nikon D5200 and Nikon D3400 have 24.0 MP resolution sensors but Nikon D5200's sensor is APS-C (23.5 x 15.6 mm ) and Nikon D3400's sensor is APS-C (23.5 x 15.6 mm ).
Since Nikon D3400'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.
One other difference between these two cameras that is worth mentioning is that Nikon D3400's sensor doesn't have an anti-alias (Low-Pass) filter. Removing anti-alias filter increases the sharpness and level of detail but at the same time, it increases the chance of moiré occurring in certain scenes.
Below you can see the D5200 and D3400 sensor size comparison.
Nikon D5200 and Nikon D3400 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
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. Nikon D5200 and Nikon D3400 sensors have been tested by DxO and the results show that D3400 has a better overall score of 86, 2 points higher compared to D5200's score of 84.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Nikon D5200 |
84 |
24.2 bits |
13.9 Evs |
1284 ISO |
Nikon D3400 |
86 |
24.8 bits |
13.9 Evs |
1192 ISO |