Your looking at a section of the Sun with Sun-Spots visible. I was preparing for the Solar Eclipse in 2024, this shot was taken with the same equipment and technique and my Mylar style white-light filter.

In order to make sure the Focus is good for The Sun, is not so easy. It's not just go to 'Infinity' and expect that will be good. I actually attach an extra plastic-ring on my focus-ring, and remove the collar on my Tamron lens. See this video: https://youtu.be/thsCypJSgUM?si=wqmEV3JavwHLlKI9 Where I explain how to focus the sun with a long-zoom lens, and I attach a Gear ring. On a literal shoestring budget.

Then since I haven't purchased a tripod that has a auto-mechanical tracker... I have to manually keep the 'Sun' in frame. Which is also not so easy at 840mm. (Plus it's an APC crop) I have to find the Sun at 500 to 600mm then zoom-all-the-way in, then use that focus method in the video...

Then I have my phone and larger tablet screen hooked up. I don't rely on the rear-LCD screen or a View-Finder. You must see it in a larger screen to be able to determine if your manual-focus has been achieved. Then use 5x to 10x, and look at a sun-spot.

Then I use my cell-phone attached via-bluetooth, and take a plethora of shots usually in the 100s. At a couple of different Shutter-Speeds... Probably only the 1/2000 was stacked in the end here though.

Then in Post-Processing I used Autostakkert to take many of those frames, and stack them together. After that step, I used the 1.5 drizzle method, and some cleanup was needed on the edges, which I used Topaz for. Then obviously the above shot is cropped, sharpened, artificially yellow colored, and the contrast was perfected.
Canon EOS M6 Mark II ƒ/9 1/2000 840mm ISO200
With the Tamron G2 150-600mm Extender 1.4x.
Taken near my home in Ypsilanti, MI.