Several big sunspots [OC]

Today was a beautiful morning, so I took the opportunity to photograph the sun again. Huge sunspots are currently visible, and I wanted to capture them.

Imagining the different sizes in astronomy is probably one of the most difficult, if not impossible, things to do. I tried it anyway and the small black dot on the surface of the sun shows the Earth in comparison. The diameter of the sun is about 109 times larger than that of the Earth. This shows how huge these sunspots must be…

Sun Data:

• Date: 31.08.2025
• Time: 09:20 UTC
• Sun angular size: 31.7'

Equipment:

• Celestron NexStar Evolution 8” EdgeHD with Mount
• Baader Digital Solar Filter OD 3.8
• Canon EOS R5 MarkII

Acquisition Details:

• Focal length: 2032mm
• Focal ration: f/10
• Frames: 550
• Shutter speed: 1/8000s
• ISO: 320

Location:

My garden, Illnau, Switzerland

Processing:

• Adobe Lightroom Classic: Croped and exported all CR3-Files as TIFF-Files for further processing
• AutoStakkert!4: Stacked (best 25%)
• RegiStax6: Wavelet sharpening
• Adobe Photoshop: Desaturated image, one curves Chanel to increase the brightness/contrast and another Curves channel for each color with following values: RED Input 84 Output 139, GREEN Input 95 Output 20, BLUE Input 218, Output 65 to get a colorful sun (artistic choice). Added the Earth as black dot for comparison.