Sony A7R VI has a
67.0MP Full frame (35.8 x 23.8 mm ) sized BSI-CMOS sensor and features Bionz XR processor. On the other hand, Sony A7 IV has a
33.0MP Full frame (35.8 x 23.8 mm ) sized BSI-CMOS sensor and features Bionz XR processor.
Sony A7R VI's sensor provides 34MP more than Sony A7 IV's sensor, which gives a significant advantage in real life. You can print your images larger or crop more freely.
On the other hand, please keep in mind that Max sensor resolution is not the only determinant of resolving power. Factors such as the optical elements, low pass filter, pixel size and sensor technology also affects the final resolution of the captured image.
Another similarity between these two cameras is that both Sony A7 IV and Sony A7R VI sensors lack anti-alias (Low-Pass) filters. 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 A7R VI and A7 IV sensor size comparison.
Sensor Size and Resolution Comparison image of Sony A7R VI and Sony A7 IV Cameras
Sony A7R VI and Sony A7 IV 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. On the other hand, since Sony A7 IV has 103% larger pixel area (25.88µm 2 vs 12.70µm 2 ) compared to Sony A7R VI, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.
DxOMark Sensor Scores
Both Sony A7R VI and Sony A7 IV 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, A7R VI has scored 100, 3 points higher than A7 IV.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Sony A7R VI
100
26.1 bits
14.8 Evs
3187 ISO
Sony A7 IV
97
25.4 bits
14.7 Evs
3379 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 A7R VI
or the
Sony A7 IV ,
including hyperfocal distance.
