See the rush documentation in Section 2.5 for more information.
$ cd /rotse/data/pipeline/
$ ls color=never image/filename.fit > file.list
$ cd /rotse/data/pipeline/image/
$ ee filename*.gif &
The Electric Eyes program (ee) has a useful slideshow option when multiple files are specified on the command line. You can now page through the images, and watch the various subregions as the telescope is brought through focus. If the various subregions go through best focus at significantly different focus positions, something is out of alignment.