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Sun in CaK first image

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#1 Stargazer3236

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Posted 23 May 2020 - 04:07 PM

I am just starting out in Solar Imaging, although I have been imaging deepsky and planets for the last 5 years. Here is my first shot, in CaK using an AT80ED telescope, Lunt 1.25" Herschel Wedge and a Baader CaK double stacked Solar Filter attached to my ASI294MC camera. Image taken using SharpCap 3.2 Pro, processed in Autostakkert!2 and wavelets in Registax 6.

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#2 hopskipson

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Posted 23 May 2020 - 07:08 PM

Not bad for a first attempt.  I'm a little surprised you captured some of the plage with such a wide bandpass filter waytogo.gif.  I purchased an Omega Ca K II on ebay and it has a slightly narrower bandpass.  I mainly use it to double stack my Lunt filter. What I found to be better was to match the sensor to scope.  With the 294 sensor at 393 nm wavelength you want to be closer to f/29 so a barlow may be worth a try.



#3 sunnyday

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Posted 23 May 2020 - 08:25 PM

it is very successful for the first time.
thanks.



#4 Stargazer3236

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Posted 23 May 2020 - 10:03 PM

Not bad for a first attempt.  I'm a little surprised you captured some of the plage with such a wide bandpass filter waytogo.gif.  I purchased an Omega Ca K II on ebay and it has a slightly narrower bandpass.  I mainly use it to double stack my Lunt filter. What I found to be better was to match the sensor to scope.  With the 294 sensor at 393 nm wavelength you want to be closer to f/29 so a barlow may be worth a try.

How do you attach this filter? Is it screwed into the imaging camera? Do I need an ERF or Solar filter in the front of my refractor? Like I said in my report, I use the Lunt Herschel Wedge instead of a Solar filter and it all works out nice.



#5 hopskipson

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Posted 24 May 2020 - 09:17 AM

I used it screwed to the camera's nose piece BEHIND the Lunt Ca K line filter.  The Lunt has it's own ERF and blocking filter.  It helps minimally by providing a little contrast by darkening the view.  If you used it behind the wedge I think you would get the same results as the Baader you have.

 

I also have a wedge.  It might make an interesting experiment to see what if any difference it produces.  Unfortunately, lots of clouds for today. 

 

Here's a link to the filter on ebay: https://www.ebay.com...XYAAOSwEeFVGzDU

I can't recommend you buy it as my results didn't approach the image he was able to get, but to be fair maybe I didn't use it as described.



#6 Stargazer3236

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Posted 24 May 2020 - 02:45 PM

Is the purple color shown in advertisements added during/after processing?



#7 hopskipson

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Posted 24 May 2020 - 08:46 PM

In the description it seems heโ€™s using a dslr so it might not be added color as with a mono camera. Most images you see on this forum are with mono cameras and the color is added in processing.

#8 MalVeauX

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Posted 24 May 2020 - 09:28 PM

Is the purple color shown in advertisements added during/after processing?

Post. Always. :)

 

Very best,




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