David H Haffner SrI did another resolution test for the DH 4.2 spectrometer today because I made some minor adjustments to the DVD grating and got a really good calibration with a quality fit of 7. ( the middle BLUE band is at 438nm ( 3nm over specs/perfection would be 435nm,) and the GREEN band is at a near perfect 547nm ( 1nm over spec.)
So I am just tickled pink!!
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