Hi icybird,

The us_array.dll itself does not have the option to put an additional subaperture onto each element of the array. If you wish to do some programming, you could save a modified us_array, using the existing C file as a template. Another option would be to put a User Defined aperture onto the whole surface, using the UDA file format commands to generate your own complex aperture. The help page ‘User Defined Apertures and Obscurations’ has the commands you can use. This is probably easier, but you would need separate files to make any changes other than scaling or decentering the whole mask.