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25 July 2020 at 3:37 pm
#582919
![](https://britastro.org/wp-content/uploads/2016/11/picture-146-1478110706-80x80.jpg)
Participant
Here is a link to the handbook. (dated feb 2016)
https://www.sxccd.com/handbooks/Handbook%20for%20the%20SX%20Spectrograph.pdf
The spectrum images there show very bad astigmatism, which is claimed to be an advantageous feature ! (It is not for serious use) though the spectra in the video did not look as bad as this so perhaps some improvements have been made.
Robin