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Sunspot in white light helium band


riklaunim
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Managed to get "first light" for few filters in white-light solar imaging with Baader Astrosolar ND 5.0. I've compared TiO, Solar Continuum, Astrodon UVenus, He-I, He-II, RG-1000, Si and H-alpha filters. In visual and in imaging He-I was best. Next He-II, and Continuum (that was already bad in imaging). H-alpha close to He-II. Other filters didn't performed well. TiO had very low contrast of the sunspot vs the background. RG1000 and Si filters similar effect. Scope used: C11 + some thermoisolating foam :)

f/10 DSI III Pro, He-I filter, Registax 6 vs Registax 5:

hel-1-registax6.jpg

hel-1-registax5.jpg

f/20, Basler Ace, He-I filter:

he-1-f20-1.jpg

f/10, Basler Ace, He-I filter:

he-1-f10-2.jpg

he-1-f10-1.jpg

f/10, Basler Ace, He-II filter:

he-2-f10-1.jpg

he-2-f10-2.jpg

i6a4hx.jpg

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