Both Pentax K-5 and Pentax K-500 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-5 and K-500 sensor size comparison.
Sensor Size and Resolution Comparison image of Pentax K-5 and Pentax K-500 Cameras
Pentax K-5 and Pentax K-500 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 Pentax K-5 and Pentax K-500 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, K-5 has scored 82, 3 points higher than K-500.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Pentax K-5
82
23.7 bits
14.1 Evs
1162 ISO
Pentax K-500
79
23.7 bits
13.1 Evs
1087 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-5
or the
Pentax K-500 ,
including hyperfocal distance.
