Sweet setup It looks great.
Thanks for sharing so much info. You are sure to inspire lots of people to do a DIY Solar install.
There are 2 aspects for your question.
1. The solar image should be focused on the slit (by moving the whole spectroscope),
2. the eyepiece/camera should focus also on the slit (by adjusting the collimator lens).
Usually, (2) is more tedious and (1) is relatively simple.
btw I have retired.
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