Seeing Them or Not Seeing Them

[Don Schaeffer]

https://www.youtube.com/watch?v=ZVmgx2vK1jw
For my own purposes I have been playing with lighting and the use of the condenser diaphragm to make the smallest organisms much more visible. When I adjusted these things to increase definition and depth of field I could really get a sense of how much life is wriggling around in my mud puddle water.