It has been my understanding that Rollei Pan 25 is repackaged 120 Maco UP 25 (see here). The Eastern European Maco was fine grained panchromatic film capable of stunning enlargements comparable to the much lamented AgfaPan APX 25. It also suffered from less than stellar quality control, much the same as the Rollei offering. Rodinal gives excellent, if not the finest grained results. PMK Pyro may be preferable for the greatest enlargement potential.
(Rollei Pan R25 120, PMK Pyro)
Floating Erratics & Cumulus, Tenaya Lake
(Maco UP25+ 120, Rodinal 1:100)