Histogram of H-alpha Tuneable Etalon???

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contefrederic
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Joined: Sun Aug 05, 2018 9:20 pm

Histogram of H-alpha Tuneable Etalon???

Post by contefrederic » Sun Aug 05, 2018 9:37 pm

Anyone have an image or drawing of what the histogram of the Sun looks like when a tuneable etalon is at 656nm (Lunt 80mm THa single stack). I am having trouble visually seeing much on the surface of the Sun (old age?) when trying to tune the etalon so I decided to use the histogram and try and find the sweet spot and then use a CCD to image it, but I need to know what the histogram should look like when I get to that spot. I have read that the histogram flattens out at that point. I was hoping someone else had crossed this bridge and had made note of the histogram when tuned. My Google searches have been unfruitful.
Thank you

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