Two questions: 1) why do all of the plots have different X axes ranges and 2) can the unusual 'dip' in the "no sample" Solux plot be explained?
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Two questions: 1) why do all of the plots have different X axes ranges and 2) can the unusual 'dip' in the "no sample" Solux plot be explained?
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Ok, so it seem that Spekwin doesn't preserve the X axes over mat operations? If so, that is very unfortunate as when plotting curves through processing steps it is very necessary to plot them with the same X axes values. No, not because the data is incorrect, but because plots are visual devices and humans find it difficult to automatically visually scale and re-size plots when comparing their characteristics. So, investigating how to either correct this plotting problem or work around the defect would be a good thing.
Interesting plot comparison for the Solux. I doubt the 570-575 notch is related to any residual film with tends to be blue to purple in color (shorter wavelength). However, since the two plots are relative, what is different is a peaking at 400 instead of 475 and 620 instead of 580. I'd guess these differences, plus the notch at 570 instead of 575, is evidence of the difference in RGGB filtering curves between the two camera types. Your camera appears to have a B filter (and maybe raw sensitivity) that is more tuned to UV, the center wavelength difference between G and R is a bit larger (so shifted, deeper notch) and much less R sensitivity. Was the IR filter removed? If not, that might account for the more dramatic sensitivity difference between 400 and 700 (i.e. if the plot scaling of my 475 peak were equal to your 400 peak, your curve would appear to 'roll-off' faster from 450 to 650). It's just good to understand the root cause behind differences when attempting to measure the same source so as to know the implications for other measurements. The Sanm camera is not a great camera, but its measured Solux response does match with it's expected performance. Given the smooth Solux source spectra, I'm not yet able to explain the response of your camera. You might plot (with the same X axes) the Solux responses of (no sample container) vs (sample container w/o sample) -- i.e. is the container having some effect?
Two questions: 1) why do all of the plots have different X axes ranges and 2) can the unusual 'dip' in the "no sample" Solux plot be explained?
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