Both Pentax K-500 and Pentax K-30 have APS-C sized 16.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the K-500 and K-30 sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K-500 and Pentax K-30 Cameras
Pentax K-500 and Pentax K-30 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
At Camera Decision, we also look at Dxo Mark sensors when available as we think it is a good indicator of image quality.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Pentax K-500
79
23.7 bits
13.1 Evs
1087 ISO
Pentax K-30
79
23.7 bits
13.0 Evs
1129 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
Pentax K-500
or the
Pentax K-30 ,
including hyperfocal distance.
