....astro-optics page....hi-res Ebert spectroscope...QMAX spectrometer
wpo - simple grism spectrograph with reflective slit
Another simple arrangement for a low resolution spectrograph using
1] a chrome eyepiece as a reflective slit
2] an achromatic doublet lens of ~120mm fl as a collimator eg parallel light
3] a combined transmission grating in contact with a weak prism eg a grism
4] a camera focused on infinity to record the spectrum.
The Mercury [Hg] lamp is a common fluorescent tube showing emission lines whilst the remaining spectra of sunlight with magnesium [Mg] and sodium [Na] identified.