  We present observations of a new very low mass field binary, discovered
during an infrared imaging survey of 250 DENIS L and very late-M dwarfs.
DENIS-J055146.0-443412.2 is an M8.5+L0 pair, with a physical separation of over
200 AU. This makes it the widest very low mass binary known in the field, by an
order of magnitude. Such a system is fragile, and it would not have survived a
close encounter with a third body. Its existence demonstrate that some very low
mass stars/brown dwarfs form without ejection from a multiple system, or any
other strong dynamical interaction.
