Fig. 5
From: A low-dispersion spectral video camera for observing lunar impact flashes
Images obtained in our laboratory calibration experiments for the monochromatic light source. The wavelength is shown on the right side of each frame. The grayscale is inverted. Because of the brazed-type grating characteristics, the positive-order images (the left side in each frame) are brighter than the negative-order images (the right side), and the brightness ratio between the + 1st-order images and the zero-order images depend on wavelengths