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Big spot and first light of Altair 393-3nm filter / Ca K Alluxa 0.37 nm / 23 feb

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#1 ch-viladrich

ch-viladrich

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Posted 23 February 2024 - 03:14 PM

Hi,

 

Unexpected clearing this morning, and turbulence was quite reasonnable considering the low height of the Sun. I was a good time give the Altair 393-3 nm its first light :

 

http://astrosurf.com...-3nm-IMX533.jpg

 

The funny thing is that with this kind of filter (this is also true with the Antlia 393-3 nm) you can make out the prominences by changing the visualisation thresholds.
But I must admit the 14 bits of the IMX 533 helps a lot. This is actually the only situation where I was able to see a difference between 8-bit and 14-bit acquisition.

http://astrosurf.com...-IMX533-ddp.jpg

 

And back to the Alluxa Ca K 0.37 nm :

 

http://astrosurf.com...37nm-IMX533.jpg

 

I could not go double-stack after this because the cloud and the rain arrived  ...

 

Clear skies !

 

Christian


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#2 steveward53

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Posted 23 February 2024 - 03:34 PM

Hi Christian ,

 

Where does one find this Altair 393 3nm ... ?

 

I can only find reference to the Antlia 393 3nm and the Altair G-band 2nm (which is the one I am considering purchasing )



#3 gstrumol

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Posted 23 February 2024 - 07:32 PM

Here is a photo I took using the Antlia 393nm wedge, the AT80EDL, and a Canon DSLR:

 

CakCombo.jpg

(click to enlarge)

 

I'm curious about what you said about being able to extract prominences through some visualization techniques. Can you elaborate? Thanks


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#4 hornjs

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Posted 23 February 2024 - 11:20 PM

Great images Christian!  I especially like the Alluxa version.



#5 Prasad

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Posted 24 February 2024 - 07:06 AM

 Excellent as always, I enjoyed them.




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