some open slit photo - videos

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highfnum
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some open slit photo - videos

Post by highfnum »

my first look at helium D3
not as nice as those solar aliens that post here
but its there
Capture 2022-06-20T13_07_07hed3varslt.jpg
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https://www.youtube.com/watch?v=PoQINu91vZI
Last edited by highfnum on Tue Jun 21, 2022 2:34 pm, edited 2 times in total.


highfnum
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Re: some open slit photo - videos

Post by highfnum »

ha
Capture 2022-06-20T12_19_53havarslte.jpg
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https://www.youtube.com/watch?v=16nVxA8kWvA


ChrisHalpha2017
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Re: some open slit photo - videos

Post by ChrisHalpha2017 »

This is much much better!!! well done!!

but now what you need to get the best contrast is a Lyot diaphragm : if you look carefully you can see that your images are a bit "hazy" : the background isnt black and thats because of the diffracted light of the objective lens of the refractor. When you have a Lyot diaph inside the spectro and when the sky is clear it makes a huge difference. look at that video :

helium D3 : https://www.youtube.com/watch?v=FtNQv5Q ... chrisimbee

h alpha line : https://www.youtube.com/watch?v=HgtEWWv ... chrisimbee ( the background is almost black )

and this one : the slit was very open and still the background was black due to the Lyot diaphragm : https://www.youtube.com/watch?v=aetIrga ... chrisimbee


spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
highfnum
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Re: some open slit photo - videos

Post by highfnum »

I put a iris which improved image

Where does lyot diaphragm go
What position?

And thx again


ChrisHalpha2017
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Re: some open slit photo - videos

Post by ChrisHalpha2017 »

the same position as in any coronagraph : where the refractor lens is imaged by the collimator lens.


spectro-coronographe ,Bresser 127/1200 ; Bresser 102/1350 , ASI 178MM
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