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The responce curve also caused me some problems when trying to test various Energy Rejection Filters ( ERF) for solar scopes. I couldn't see far enough into the UV ( down below the CaK lines) and into the near IR to verify that the filters had good UV-IR rejection!
I'm currently using the Classical spectro to test PST etalons. These filters work by causing transmission/interference "bands" along the spectrum about 1A wide and 10A apart, obviously one of the "pass" wavelengths is the Ha, but they also pass a LOT of light all the way down to the UV. This is the job of the blocking filter; to suppress all these "bands" and only allow the Ha to go through.
Weather permitting, I'll get some images to show the results.
All this from an old binocular lens, a s/hand Zuiko 135mm telelens and a reflection 1200lpm grating!!!!
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