The manufacturer usually measures the properties of the filters only at room temperature and parallel light. To get an idea of the properties in the telescope(77 K and F/2.35) the data needs to be processed. The way the data is obtained is indicated by the different colours of the graphs:
Blue graphs represent data which is shifted by a value calculated by the manufacturer.
Red graphs indicates that no recent data was available and the data is shifted by the shift of its predecessor.
Black graphs are data calculated by the manufacturer.
Anke Kitzing
23. Februar 2005