atmospheric dispersion

Forums Spectroscopy Varying response profiles atmospheric dispersion

Robin Leadbeater

Hi Andrew,

Yes the effect of atmospheric dispersion (particularly if combined with CA) is well known in amateur spectra too eg

but that does not seem to explain this case where the results were ok when the seeing was better, unless the target was also higher in the sky or the location was such that the parallactic angle fortuitously aligned better with the slit