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H-alpha scope imaging question

Beginner Imaging Solar
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#1 david_lyu03

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Posted 31 March 2023 - 08:00 AM

Hello,

 

my name is David and I am a high school student currently working on solar imaging using my school's equipment. I have some questions regarding the process and would appreciate your suggestions and comments.

 

In my imaging, I used the ZWO ASI533MC camera with a 2x barlow lens, and I have attached the resulting image. I am curious about the bright red edge present in the photo and how it differs from images taken without the barlow lens. I have observed that adjusting the focal ring can change the size of the red edge, and the image I have provided is my best attempt at reducing its size. Could it be chromatic aberration? Could it be focusing issue? 

 

The Solar Telescope I used is the 70mm NearStar Hydrogen-Alpha Solar Telescope.

 

 

2023-03-29-1458_9-Sun_Planet_50_Sharp38_B4.0_C1.0_S1_N1_SUN.jpg with the 2x barlow lens

Screenshot 2023-03-31 at 8.41.52 AM.jpg the one without barlow lens. 

 

Thank you for any input you may have!


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#2 MalVeauX

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Posted 31 March 2023 - 08:05 AM

Hi,

 

It's banding from the tuning causing uniformity issue, it goes off band from h-alpha line and goes brighter as more photosphere light leaks through and is not blocked but is still within the bandpass of the blocking filter post-etalon. Either the tuning was off, or the etalon is incapable of a uniform presentation.

 

Very best,


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