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We present the results of deep I-band imaging of two BL Lacerate objects, RGB0136+391 and PKS 0735+178, during an epoch when the optical nucleus was in afaint state in both targets. In PKS 0735+178 we find a significant excess overa point source, which, if fitted by the de Vaucouleurs model, corresponds to agalaxy with I = 18.64 +- 0.11 and r_eff = 1.8 +- 0.4 arcsec. Interpreting thisgalaxy as the host galaxy of PKS 0735+178 we derive z = 0.45 +- 0.06 using thehost galaxy as a "standard candle". We also discuss the immediate opticalenvironment of PKS 0735+178 and the identity of the MgII absorber at z = 0.424.Despite of the optimally chosen epoch and deep imaging we find the surfacebrightness profile of RGB 0136+391 to be consistent with a point source. Bydetermining a lower limit for the host galaxy brightness by simulations, wederive z > 0.40 for this target.

Redshift constraints for RGB 0136+391 and PKS 0735+178 from deep optical imaging