Both Sony HX20V and Sony HX90V have 18.0 MP resolution sensors but Sony HX20V's sensor is 1/2.3-inch (6.17 x 4.55 mm ) and Sony HX90V's sensor is
Since Sony HX90V'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 HX20V.
Below you can see the HX20V and HX90V sensor size comparison.
Sensor Size and Resolution Comparison image of Sony HX20V and Sony HX90V Cameras
Sony HX20V and Sony HX90V 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.
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 HX20V
or the
Sony HX90V ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(1/2.3-inch versus ),
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.
