Key words: Vilnius photometric system -transformation equations -response functionsIn 1986 we realized the Vilnius seven colour photometric system on the 90 cm reflector of the Kitt Peak National Observatory using the RCA No.2 CCD chip and a special set of filters. The square filters of 50 X 50 mm size are cemented with Canadian balsam from the glasses listed in Table 1. Almost all glasses (except one) were made in different factories of the Soviet Union. The S filter is the interference KPNO filter No.628. In 1987 the glass Z filter was replaced by an interference filter made in Vilnius and the KPNO No.628 filter was replaced by an interference S filter made in Vilnius plus glass filter SZS 25 added to cut off the secondary leak at A > 8500 A. Both these interference filters are round and of 40 mm in diameter.
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