I used the Hero 573 Fube Nib as it is a highly flexible tool. It can make very fine lines (when you use the fountain pen upside down) and if you draw at an angle, creates very thick lines. It is also a flexible nib meaning that be pressing on the nib, more ink flows out which makes drawing with one pen only ideal. I really liked using it today, even though it does take some time to get used to it. It is a very heavy fountain pen though, so for those of you who like drawing “light” this is not your pen.
Paper: Stillman & Birn Zeta Series sketchbook #20
Pen: Hero 573 Fube Nib with DeAtramentis Document Black Ink (waterproof)
Location: Rigaud, Québec, Canada from my imagination