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Yes, it can be simpler as you say.
I mention above a 3 stripe chart with a 21 step scale behind it which can give you relative speeds of a film at 3 different wavelengths (RGB) once you calibrate it.
PE
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 Originally Posted by Photo Engineer
This harmonic vanishes with a UV filter and is one of the faults of these particular instruments.
It's not really a fault, it's just a function of using a diffraction grating. A spectometer using a prism will not have this issue. Prisms have their own issues...
I bought a 4 inch spherical mirror with a diffraction grating on it to make one of these. Someday I'll do it!
Colored LEDs should be an easy way to calibrate any spectrosensitizer now that red, green, blue and even UV LEDs are readily available.
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Yes, as you say Kirk.
We have big instruments at EK without this problem. They are used for major work.
PE
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In the 1960's I worked for a company that produced spectrometers. For most purposes we supplied xenon lamps as the light source. I do not remember the range thes lamps cover but we normally worked with the uv and the near uv regions. All mirrors were first surface. All the lenses and windows were quartz or equivlant. Most calibrations were done using varions compounds that had known adsorbance lines or floursed (spelling) at known wave lengths. Most of the equipment we produced was used in research labs, either in universities or medical research labs.
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