Hello!!
Last night I was testing the DADOS and I took some spectra of HD96325, a G0 star with a 8.97 V magnitude.
They are 300s integration shots with the atik 16HR at the primary focus of an 152mm f/6 achromatic refractor.
My objective was to evaluate the performance of this optical configuration, which in principle is the more comfortable to work but not the most suitable for this spectrograph...
Reviewing the images, it can be seen that a fairly pronounced chromatic coma appears at both ends of the spectrum.
I imagine that it is the logical consequence of using an achromatic telescope with a low focal ratio...and that it will possibly improve and even disappear if a focal extender, that narrows the cone of light, is inserted between the telescope and the spectrograph.
I would appreciate any comments and/or suggestions about this topic.
Greetings.