Both Canon R8 and Canon T8i have 24.0 MP resolution sensors but Canon R8's sensor is Full frame (36 x 24 mm ) and Canon T8i's sensor is APS-C (22.3 x 14.9 mm ).
Since Canon R8'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 Canon T8i.
Below you can see the R8 and T8i sensor size comparison.
Sensor Size and Resolution Comparison image of Canon R8 and Canon T8i Cameras
As seen above, Canon R8 has a 2.6x Larger sensor area than Canon T8i. 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
Canon R8
or the
Canon T8i ,
including hyperfocal distance.
One thing to watch when comparing these two: they have different sensor sizes
(Full frame versus APS-C),
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.
