I find the water droplets fascinating no matter where they are found (on a leaf, on an object like a glass or … a camera etc). It’s always worth having them photographed! However it is not always easy to get breathtaking pictures. You need to try different positions, different angles and the lighting needs to be adequate. Of course additional light sources (other than the natural ones – e.g. a flash) can be used to improve the lighting conditions (personally I prefer to keep the conditions as natural as possible). A macro lens can be very helpful although a standard zoom can also bring good results.
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I took these pictures at home in the courtyard just after the rain was over. However you don’t need to wait for a rain in order to take stunning droplet pictures! You can also create them “artificially” by pulverizing water on the object where you need them to be. I won’t go into details as there are plenty of tutorials on the Web describing how to prepare the scene.