We present a deep R-, I- and Z-band photometric survey of the open cluster Praesepe. 26 new photometric candidates have been found with I > 17.8, extending Praesepe's main sequence down to I = 21.5. 19 of the new members are brown dwarf candidates, and two could be binary brown dwarfs. Praesepe's mass function is derived, and found to be rising into the brown dwarf range with α ≥ 1.5.
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Pinfield et al. (1997) studied this question.