The results of the Koenigstuhl survey in the Southern Hemisphere are presented .
I have searched for common-proper motion companions to 173 field very low-mass stars and brown dwarfs with spectral types > M5.0V and magnitudes J \lesssim 14.5 mag .
I have measured for the first time the common-proper motion of two new wide systems containing very low-mass components , Koenigstuhl 2 AB and 3 A–BC .
Together with Koenigstuhl 1 AB and 2M0126–50AB , they are among the widest systems in their respective classes ( r = 450–11 900 AU ) .
I have determined the minimum frequency of field wide multiples ( r > 100 AU ) with late-type components at 5.0 \pm 1.8 % and the frequency of field wide late-type binaries with mass ratios q > 0.5 at 1.2 \pm 0.9 % .
These values represent a key diagnostic of evolution history and low-mass star and brown-dwarf formation scenarios .
Additionally , the proper motions of 76 field very low-mass dwarfs are measured here for the first time .