Alpy 600 calibration

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John Savage

Hi Robin,

Thanks for your comments, tips and wealth of information. And sorry for being a bit tardy with an acknowledgement.

I have been busy developing a utility to blend images of stellar and calibration lamp spectra. Using this I found that I couldn’t get consistent polynomial fits simultaneously to both stellar absorption lines and calibration emission lines, especially if the ‘scope had been moved in between. This pointed to a flexure problem. I was dismayed to find I hadn’t tightened all six of the Alpy thumbscrews properly. I should have checked this much earlier!

Now to look again at focusing for the blue end of the calibration line spectrum.

Best wishes,