We carry out the first complete calculation of kinematic power corrections
~t/Q^2 and ~m^2/Q^2 to the helicity amplitudes of deeply virtual Compton
scattering. This result removes an important source of uncertainties in the QCD
predictions for intermediate momentum transfers Q^2 ~ 1-10 GeV^2 that are
accessible in the existing and planned experiments. In particular the finite-t
corrections are significant and must be taken into account in the data
analysis.Comment: 4 pages, 4 figure
