Spectral response of the DIY Spectrometer & why I can’t detect red

The following is a series of tests performed tonight of the spectral response of the “DIY Spectrometer”. Andy The “DIY Spectrometer”: Feed in to the DIY Spectrometer: No telescope tonight – direct feed into the end of the device below that I made below using a beam splitter and modified Cheshire eyepiece. Spectral Response: Spectrum … Continue reading Spectral response of the DIY Spectrometer & why I can’t detect red