Support: LS Series Lens Spectrographs
How should I select external optics to bring light into my spectrometer? [+][-]
Q: Can you provide some information on selecting external optics to bring the light into my spectrometer?
A: Below are some comments on lens selection.
Make sure the lenses are chromatically-corrected for the wavelength region of interest. You don’t want a large change in focus at different wavelengths.
Spectrometer Aperture (f/#):
In some instances it might be a good idea to use a lens pair to accomplish the object-image transfer from the sample to slit.
The first lens collects and collimates light from the sample.