An assembly for Kratky collimator is provided. The assembly may be used for a small angle x-ray camera or system requiring such filtering. The assembly may include a first block with a first working surface and a second block with a second working surface. The first and second blocks may be aligned with the first working surface pointing an opposite direction of the second working surface and the first working surface being aligned in a common plane with the second working surface. In some implementations, the first block may comprise a crystal material. In some implementations, an extension may of the first block may be configured position a beamstop.