So what’s the word on which vendor to go with for the Johnson-Cousins filters.
Chroma? Baader? Optolog? Others?
Thanks in advance for the clarification.
The original post was written half a year ago, buy maybe my data about Baader (+ some extra) photometric filter measurements would be useful for you and for community in general.
Measurements were done in the radiometry lab of Tartu Observatory, using a double monochromator and a silicon trap detector, scan range is from 300 nm to 1200 nm.
Please see them from following repo. Textual part in that repo is in Estonian, because that is a digital appendix to a high-school science project. Overview graphs are all there:
and detailed graphs in subdirectory “filtrid_detailne_standardiga”. Filter names are in the filenames, so the content should be understandable 
ASCII data about measurements is: filtrid/andmefailid at main · otteenmae/filtrid · GitHub in directories “filtrid_detailne” and “filtrid_ulevaade”.
Best wishes,
Tõnis, ETOA
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