Table 5: HUDF Sensitivities
Filter  Exposure   ZP     <Sky>  Predict  10sigma   50% 
          ksec          /sec/pix    AB      AB      AB

F435W    134.9   25.67   0.0284   29.09   29.08 
F606W    135.3   26.49   0.1358   29.29   29.45    
F775W    347.1   25.65   0.0780   29.21   29.35     
F850LP   346.6   24.86   0.0415   28.67   28.70    29.4 

The ZP <Sky> from the ACS manual. Read noise: sigma = 5
50% recovery magnitude is the average disk/bulge for point sources.