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I am also preparing spectrograph fot eta event.
Especially because the company I work for is in serious trouble, and I may find myself in retirement sooner than expected.... so I will hopefully have much more free time for astronomy.
At this moment I am thinking of my Hartridge spectrometer, coupled with optical cable to C11.
Another one is Star analyser (100l/mm) mounted inside c11.
3D printer will come here very handy...
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