[en] The use of borosilicate-glass-capillary optics at a chosen wavelength for low scattering has been explored using an undulator beam at the ESRF. With a 2.3 μm beam at 0.092 nm wavelength, a silver behenate powder sample was scanned in two dimensions with a 2 μm step width. Scattering from single crystallites with d001 = 5.83 nm could be observed. The limit for observation, at low angles, was ca s ≅ 0.1 nm-1 (s = l/d for d ≅ 10 nm). (au) 10 refs