Both Fujifilm X30 and Pentax P80 have 12.0 MP resolution sensors but Fujifilm X30's sensor is 2/3-inch (8.8 x 6.6 mm ) and Pentax P80's sensor is 1/2.3-inch (6.17 x 4.55 mm ).
Since Fujifilm X30'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 Pentax P80.
Below you can see the X30 and P80 sensor size comparison.
Sensor Size and Resolution Comparison image of Fujifilm X30 and Pentax P80 Cameras
As seen above, Fujifilm X30 has a 2.1x Larger sensor area than Pentax P80. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in 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
Fujifilm X30
or the
Pentax P80 ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(2/3-inch versus 1/2.3-inch),
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.
