Magnetic spin-echo SANS (SESANS) gives real-space information about correlations in a ferromagnetic material on a length scale 10-10 000 nm, inaccessible in conventional SANS. In non-magnetic SESANS correction for multiple scattering is done analytically. For magnetic SESANS we propose a modified formula and verify it by magnetic-SESANS measurements in stacks of copper plates with electro-deposited Ni. Such Ni film consists of domains magnetized perpendicular to the plane and length equal to its thickness. Perspectives of the technique are mentioned.