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Perfect. Thanks a lot Emmanuel.
Juan José

Hello Emmanuel,
I see that you use a Newton f/4 with the Alpy 600. Is it necessary to put an intermediate lens to correct the focal ratio?
Greetings.
Juan José

Thanks a lot Robin. I added my name as interested in a future (?) Alpy200.
Cheers.
Juan José

Having previously talked several times with Robin Leadbeater on the subject of spectrographic monitoring of supernovae when they fade, and seeing that there is a push towards an Alpy 200, I would be interested in that possibility if Shelyak finally decides to build it. Juan José

Thanks Robin, Yes, some time ago you already told me about the special Alpy 200 answering a question about how to obtain supernova spectra when they fade. Shelyak does not produce it in a standard way although it might be possible to make something similar using 3D printing. What effective resolutio...

Hello, My question is about how to improve the vision of objects in an Alpy600. I am using it with an SC8" or with an RC12", in both cases at f/6.3. For observation and guidance I am using an Atik Titan which, combined with the SC8", allows me to obtain spectra of stellar objects of m...

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Hello Joan
Fantastic spectrum of SN2022hrs with your échelle NOU. I thought that at resolution 9000 it was not possible to obtain spectra of such faint objects. An exposure of 3.5 hours is perfectly acceptable.
Greetings
Juan José

Hi Robin,
Thanks for the information on spectroscopy of dim objects. I will contact you by email about it.
Greetings
Juan José Pueyo

Supernovae within the reach of amateurs have magnitudes usually between +12 and +18. So far, using the Alpy600 with Atik 314L+ (for spectrum) and Atik Titan (for observation and guidance) I have reached magnitude +14. The telescope is a SC8" at f/6.3. The problem to go lower is that I have to s...

I obtained a fourth spectrum, this one after the decrease in luminosity of the nova. The continuous background has diminished considerably. In addition to the initial iron emission lines (Fe II), new lines have appeared that I have not been able to accurately identify.