Quote:
Originally Posted by Merlin66
..(If you use a positive collimating lens you can then think about adding an entrance slit for even better results.)
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Yep.. I am considering that for the future
I have an old Panagor slide duplicator. the mechanic is ideal for that sort of thing... (coronagraph as well), see attached sketch attached).
It has standard M42x0.75 mm threads, so it is easy to change configuration.
Also, I 3D-printed inserts to hold various lenses..
The only disadvantage is length (~300 mm).. but I can live with that :-)