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Spectroscopy: RC or Classical Cass?


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#1 Chocolate Elephant

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Posted 01 September 2013 - 06:15 AM

Is there much advantage if any in choosing a CC over an RC for spectroscopic work?



#2 Dr. Werner Van Alstyne

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Posted 11 January 2017 - 11:09 PM

Did you ever receive a response to your question? I am curious also before I purchase. Alan Noot in Medina, Minnesota.

#3 astrobry

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Posted 04 February 2018 - 12:19 PM

Hello,

 

I noticed this question now, a year later :).

depends on which spectroscopy you want to do, all range or mainly H-alpha? I am not a specialist, but I do notice that in certain telescopes with correction lenses some scattering gave at wavelengths of <4000 angstom and for example at a broad spectrum and lower than 4000 A the line of the spectrum on the image fanned out (becomes wider). so I think it's best to have as low as possible  'glass' in the beam of light to the CCD-camera, or you must have very good coatings . 

my 2 eurocents.

Erik.


DDM85 standard, AG16 astrograph, SBIG STL 6303E, FLI ATLAS focuser




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