An object, which is an image or a slide negatip a picture, placed in front a lens and disinari with parallel and coherent light from a laser. In the field of focus This second lens Fourier analysis will occur in two dimensions of distribusi intensity on the field objects. Medan Iistrik in the field of focus is the Fourier transformation of the electric field in the field of an object. Fourier components that occur relate to the frequency in the space domain, frequency-frequency space is called the frequency or spatial frequencies. If you focus on the field or fields of transformation of this put a barrier with certain forms, we can remove the frequency-specific frequency space. This means that frequency - a certain frequency is not forwarded for final shadow form. As a result, shadow who is going to be changed. This technique is called spatial filtering. With practice this technique, we can take the form of noise dots or parallel lines the periodic, such as television images Raster. Contranst of the image can also be improved. In this article discussed the basics of spatial filtering teoretik of the outline. Then discussed the description of the experiment. Last reviewed several experiments that can be done with the same equipment practice. Sutrisno ** Eksperimen ini dilakukan di LAPAN, •• Departemen Fisika, ITS.