The image was taken by a 30 years old TEFNON 70-200mm lens at F8.
Since I fixed my TEFNON 70-200mm zoom lens a couple years ago, it is never going out until today. It’s normal for a 30 year old manual focus lens has fungus sticking on the inside elements.
Today is World Pentax Day, I brought it out with me and took some test shots. It performs pretty well after the fix, especially the color rendering and bokeh are even better than some modern lenses IMO.