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| p.1 #2 · Set Up Capable of Capturing 10 Microns or Less |
I currently take a number of water drop photos. I take most of my photos with a 100mm macro and obtain photos like this.
The Bubbleship by CalevPhoto, on Flickr
Keep in mind this is not 1:1. I haven't used my MP-E 65 too much for water drops but it was used for this one. The needle should give you an idea of size. This is about 2x.
A Drop of Me by CalevPhoto, on Flickr
My understanding is a needle is about .5mm, so my educated guess is if you photographed at 5x then you should be able to discern .05mm increments. At 5x the working distance is 41mm.
If you want to go above this, then you are mainly looking at microscope objectives. Working distance and DOF will be issues though. I have a Nikon 10x .25 but it only offers 10.5mm of working distance, which is actually not bad. The Mitutoyo objectives offer better working distances of 33.5mm on the 10x and 20mm on the 20x (I have this one). I'm not sure what you would do about the DOF though as it is certainly too narrow for a spray of water drops - but maybe you could figure something out that would tell you what you need to know from a scientific aspect.