Raindrop lenses on Helm Crag

The lensing effect of these raindrops on Soft Rush is impressive. We must be further away than the Principal Focus because the image is inverted. The white bottom of the drop is actually the sky. The image is smaller or diminished which means we are beyond twice the focal length. Another time I need to try to measure the focal length. Here's what was being focused, on a moody day above Grasmere