Sony A7 has a
24.0MP Full frame (35.8 x 23.9 mm ) sized CMOS sensor and features Bionz X processor. On the other hand, Sony RX100 III has a
20.0MP 1″ (13.2 x 8.8 mm ) sized BSI-CMOS sensor and features Bionz X processor.
Below you can see the A7 and RX100 III sensor size comparison.
As seen above, Sony A7 has a 7.4x Larger sensor area than Sony RX100 III. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.
DxOMark Sensor Scores
Both Sony A7 and Sony RX100 III 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, A7 has scored 90, 23 points higher than RX100 III.
Model |
Overall |
Color Depth |
Dynamic Range |
Low-light ISO |
Sony A7 |
90 |
24.8 bits |
14.2 Evs |
2248 ISO |
Sony RX100 III |
67 |
22.4 bits |
12.3 Evs |
495 ISO |