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Barnard's Loop with old, russian Helios lens

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This time I have tried old 58mm Helios lens made in CCCP attached to QHY163C ColdMOS camera. And... the lens is terrible :shocked: Only centre of the frame is OK with rounded stars. On edges or even more (1/3 of frame) there are trail not stars!
I spent two nights to take a whole Barnard's loop picture - one for Ha and second for RGB.
Camera is great and it has very nice sensitivity in Ha.

This is final image my favourite DSO:

24x300s Ha 7nm

30x180s RGB



And only Ha:



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