Both Sony RX10 III and Sony RX10 have 20.0 MP resolution sensors but Sony RX10 III's sensor is 1″ (13.2 x 8.8 mm ) and Sony RX10's sensor is 1-inch (13.2 x 8.8 mm ).
Since Sony RX10'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 RX10 III.
Below you can see the RX10 III and RX10 sensor size comparison.
Sensor Size and Resolution Comparison image of Sony RX10 III and Sony RX10 Cameras
Sony RX10 III and Sony RX10 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 RX10 III and Sony RX10 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, RX10 III has scored 70, 1 points higher than RX10.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony RX10 III
70
23.1 bits
12.6 Evs
472 ISO
Sony RX10
69
22.9 bits
12.6 Evs
474 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Sony RX10 III
or the
Sony RX10 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(1″ versus 1-inch),
so compare them at the same framing rather than the same focal length.
Put the same focal length on the smaller sensor and it will show less depth of
field, not more, because it also crops tighter. The calculator shows the
full frame equivalent focal length for each body so you can match the framing.
