Canon 30D has a
8.0MP APS-C (22.5 x 15 mm ) sized CMOS sensor . On the other hand, Nikon D7500 has a
21.0MP APS-C (23.5 x 15.7 mm ) sized CMOS sensor and features Expeed 5 processor.
Nikon D7500's sensor provides 13MP more than Canon 30D'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.
One other difference between these two cameras that is worth mentioning is that Nikon D7500'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 30D and D7500 sensor size comparison.
Sensor Size and Resolution Comparison image of Canon 30D and Nikon D7500 Cameras
Canon 30D and Nikon D7500 have almost the same sensor size, so neither of them has any significant advantage over the other in terms of providing control over depth of field when used with the 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. Canon 30D and Nikon D7500 sensors have been tested by DxO and the results show that D7500 has a better overall score of 86, 27 points higher compared to 30D's score of 59.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Canon 30D
59
21.5 bits
10.8 Evs
736 ISO
Nikon D7500
86
24.3 bits
14.0 Evs
1483 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
Canon 30D
or the
Nikon D7500 ,
including hyperfocal distance.
