Actually for the same size lens, a larger aperture (lower f-stop number, e.g. f2.8 vs. f8) always results in less depth of field. More precision, better design and better optical quality glass all cost more.
Since more expensive optics usually tend to have a larger max aperture ...
Comments
Sensors, perhaps. Optics, not so much, when going for a shallow depth of field (one of the later graphs).
Actually for the same size lens, a larger aperture (lower f-stop number, e.g. f2.8 vs. f8) always results in less depth of field. More precision, better design and better optical quality glass all cost more.
Since more expensive optics usually tend to have a larger max aperture ...