Our collection consists of broad band and narrow band filters. For broad band imaging we have several sets of BVRI filters, which are not meant to leave their telescope. Our set of narrow band filters at the moment is still rather limited, except for (redshifted) H filters, of which we have more than 15. All filters are square, and have a length and width of more or less 50mm. Some of the larger filters do not fit into every filterwheel. There are however filterwheels to accomodate each filter.