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proms of may 15th and 16th with spectro in Littrow mode

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#1 chrishalpha2017

chrishalpha2017

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Posted 16 May 2022 - 11:03 AM

Hello guys,

 

here are a series of photos of the prominences of yesterdy and today wirth the spectroscope and different diffraction gratings :   there was a technical detail that i wanted to experiment about :  the anamorphosis .

 

In 1868 when Janssen and Secchi started to observe the solar prominences daily with a spectroscope they didnt use diffraction gratings : it hadnt been invented yet!  they were using prisms . And the way they were using it didnt produce anamorphosis (or shrinking) of the images.

 

I've always noticed that my images were a bit flatter that they really are compared to photos taken with real H alpha filter.  So i browsed through books about spectrography etc... and I found that there is a config that allows no deformation of the final image : aka LITTROW design.

 

Here are some results... (with and without LITTROW mode)

 

1200 tmm littrow spicules_20220515_155518.753_UT comparaison anamorphose.jpg

 

 

1200 tmm classic 12_151414.120_UT +++  comparaison avec anamorphose.jpg

 

600 tm littrow  grosse protubérance + best_  mode coro.jpg

 

600 tmm Littrow  +++ annotée.jpg

 

600 tmm littrow +++3_20220516_130638.280_UT.jpg

 

1200 tm littrow annotée.jpg

 

 

1800 tm littrow champs de spicules++++.jpg

 

 

 

 

 

 

 

 

 

 


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#2 chrishalpha2017

chrishalpha2017

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Posted 16 May 2022 - 11:06 AM

16 mai 2022  annotée.jpg

 

 

Chris

 

 


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#3 MalVeauX

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Posted 16 May 2022 - 11:28 AM

Awesome Chris!

 

Very best,


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#4 chrishalpha2017

chrishalpha2017

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Posted 16 May 2022 - 05:34 PM

2022-05-16-1437_4-CI-R-Sun_Halpha++++_F1647-1784  restacked  annotée.jpg

 

1800 trmm  mode littrow ++ grand   best++++++++ annotée.jpg

 

 

 

 

 


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#5 Look at the sky 101

Look at the sky 101

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Posted 16 May 2022 - 05:57 PM

Beautiful work. 




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