since the type of "lens" used for such a picture is just mathematical. real world physics don't produce such lenses (simply impossible), thus maxwell cannot render those images.
it can only be approximated with "infinite" focus. but you won't get the real deal.
every render with maxwell has DOF, no exception.
* * *
(well, maybe not YET. nextlimit might develop other lens types for maxwell .. like spherical lenses too for qtvr panos)