Documentary about "Cartoneros" in Buenos Aires

[abasfly]

Here is the trailer of a Documentary I where I did the photography enjoy:
"Fantasmas de Capital" (Ghosts of the Capital)

http://fantasmasdecapital.com/trailer/



Sinopsis.
Since the Argentinian economic crisis of 2001, on the streets of Buenos Aires more than 6,000 “Cartoneros” push their handcarts to collect the recyclable material of the household waste. Despite their daily presence facets of their work are hidden to the urban population, as the waste collectors usually appear at dusk in trains and trucks from the poorest areas of the province. The film remains close to them and shows the stories behind their handcarts.

[8string]

Nice. What camera(s) did you use for night filming?