Odd radius halo display
Taken by Lasse Nurminen on May 19, 2022 @
Raisio, Finland
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Details:
There was a nice display of odd radius halos in south western Finland on 19.5.2022 The display lasted for several hours around midday. The brightness of the halos was changing during the display, at the brightest moments I could even spot parts of the 35° ring just barely with my naked eyes. This was the best odd radius display I have witnessed so far, including the 9°, 18°, 20°, 23° and 35° rings added with the upper 23° parhelion and the common 22° ring.
I used a round piece of a welding glass to block the sunlight to make it easier to align several photos to a stack using the dimmed sun as a guide. From a stack of photos it´s many times easier to spot even the weakest of halos that wouldn´t necessarily be visual on a single frame. One advantage of the stacking is also the effect of getting the clouds look much smoother making it even easier to identify the halos. I used a stacking software called Halostack, made by a Finnish enthusiast.
At first here is one single frame from the display (that is also one of the photos I used in the stack) and an edit of unsharp mask + channel mixer of that same single photo. The next two photos are edits of the stack of 15 photos (dehaze + unsharp mask edit and unsharp mask + channel mixer edit). The smoothing effect on clouds in the stack vs. a single frame is evident at least in this case.
Photographer's website:
No URL provided.
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