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Diffraction gratings

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Resolutions of Common Diffraction Grating Films:

CD:       625 lines/mm
SADGF:   1000 lines/mm (Simple Astronomical Diffaction Grating Film)
DVD:     1350 lines/mm
Blu-Ray: 3125 lines/mm
HCF: 200-4000 lines/mm (Holographic Coating Film)

Higher lines/mm do NOT always help making a better spectrometer.