~Oliver Wendell Holmes
This has happened often when I take extreme close-ups. I don't see anything in the lens, but when looking at the photos full size, I've seen insects, new buds or leaves, scars, mineral deposits, debris, and plant exudations. It's really amazing what's going on in the garden out of view of the naked eye. Every now and then, I put on my husband's OptiVisor (a 10X magnifier designed for jewelers) and go out to the garden to check things out. I blink, and I'm in whole new world!