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Good to know, thank you Ken.
I actually place the star to the left of the screen and try to position the spectra in the middle of the chip with its centre (green light?) roughly on the optical axis. I expect there will be some improvements with proper adapters, as at this stage I'm using thumb screws and flimsy extension tubes to hold the camera in the right place.
Happy days, the adapters have just arrived!
Okay, I'm back in business :-)
Suavi
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