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Fluoro and Neon calibration frame
Just "tuning" the neon reference lamp in the Littrow.
Ideally I'd like to get the neon reference spectrum sitting just above the main spectrum to make comparison easier.
This shot is a single Canon 350 frame ( 1/10 sec, no computer enhancements/ additions) of the fluoro test bulb and the neon. You can see from the annotations the wavelengths of both.
In the ol' days the professionals used a Dekker screen at the slit to produce an spectral image of a reference light ( sometimes Iron) just above and below the object spectra; a microscope would then be used to measure the relative positions of the lines. This is not required nowadays as the lines can be measured using their pixel position on the CCD frame, but it looks nice!!.
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