Attenuation screens of different types are used frequently in interferometer cavities when one wishes to control the intensity of one arm with respect to another arm, to achieve good fringe contrast. A study of attenuation screens for use in interferometer cavities was performed to determine the optimum attenuation screen mesh frequency, orientation, and cavity location, theoretically and experimentally. A commercially avaliable Fizeau type interferometer was used for the investigations. Screen frequencies of 500, 400, 325, 230, and 100 wires per inch were used. Experimental results with these screens of different test configurations are presented. The durable, inexpensive, and versatile attenuation screen provides an excellent alternative to coated or metallized pellicles used as attenuation filters.