I don’t usually post hardware solutions to classroom technology issues here at Embed_Ed, but this one was too good to pass up!
I tried this out quickly, and found that indeed it did work. Flipping the camera over quickly and smoothly seemed better than trying to slowly turn the camera in regards to getting the water droplet to stay in place.
It’s tough to hold it and shoot as well, which is why Alex suggested using something as a stand. Moving the object would probably be easier than moving the camera!
If you’re interested in other DIY iPhone microscope tricks, check out Sallaha’s Blog. She has some great examples of using various common lenses.