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Well, this has been something that has been of interest to me for a long time. Some years ago I purchased a Star Analyser 100, and I have tried several times to get something out of it - with no success.
I have tried with a 200mm reflector and a 90mm refractor; with a dslr, an Atik314L+ and a DMK21. I get a spectrum bar (if thats the right term) but there are no absorption lines (or emission lines).
Initially, I thought the problem was in the way I was aquiring the image. So rather than just one, I took several and stacked them. No luck. So I took more, stacked them, did the flats and darks. No luck.
Then I suspected the issue might be in the processing. If I understand correctly, I need to stretch the image a fair bit to see the lines. But I just don't seem to be able to get it. Over the last few years, I have tried bright stars, not so bright stars, dim stars, but have not tried the Sun.
I am now beginning to think that the issue may be in the placement of the Star Analyser. I may not have it at an appropriate distance from the sensor.
There is obviously something I am missing. Frustrating!
Darrell
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