LUCI's ETC uses transmission data of all filters measured by the manufacturer [BARR]. They are stored in wavelength steps of 0.5 nm. The transmission curves of these broadband filters are shown in Figure 4. All available filters (including the narrowband filters) are shown in Appendix C.
Figure 4: Broadband filters used by LUCI
The optical filters U, B, V, R and I can be chosen for the input of the object's magnitude only. They are originally described in steps of 10 nm (U) and 20 nm (B, V, R and I) [FIL-HP]. By linear interpolation the sampling was increased to 0.5 nm.

Andre Germeroth 2016-11-04