It has been drizzling and i saw double arc rainbows. it came up in my mind that whether i could have an image of the complete double rainbows with the capture of my drone. so i decided to do it and finally i had my long-awaiting image. due to the limited angle of view (26mm only), i had to take 22 individual photos and stitched them in post-processing. each of the 22 photos is an hdr photo with 5 images into 1, which means that this photo is in fact a merging of 110 photos.