Mass-Magnitude relations for K (top ), J (middle) and H (bottom) bands [CIT system] derived from Delfosse et al. (2000) for M-dwarfs (with masses  > 0.10   M_⊙) and L-dwarfs (masses  < 0.10   M_⊙) from Chabrier et al. (2000). The transition between the two relations at  ~0.10   M_⊙ has been linearly interpolated. The black curves show the most likely range of distances for the MOA-2007-BLG-192Lb system as found by Bennett et al. (2008) and the horizontal lines marks the estimate for the lens flux from the NACO data as well as the upper limit of the lens flux from measured lens+source flux for a range of possible interstellar extinctions.