  An explicit full nulling scheme for cosmic shear observations is presented.
It makes possible the construction of shear maps from extended source
distributions for which the lens distance distribution is restricted to a
definite interval. Such a construction allows to build totally independent
shear maps, at all scales, that can be taken advantage of to constrain
background cosmological parameters and systematics using the full statistical
power of cosmic shear observations. Another advantage of such construction is
that, as the lens redshift distribution can be made arbitrarily narrow, scale
mixing due to projection effects can be limited allowing controlled predictions
on the large scale shear power spectrum from perturbation theory calculations.
