Under the microscope, diatoms, a test slide.
Depending on the species of diatom the fineness of the markings varies and some species have markings close to the resolution limit of the optical microscope. Therefore diatoms are a favourite subject for assessing various aspects of the optical performance of a microscope. (This information is from an article in Micscape)
For extreme and artistic diatom arrangement, this man's work is well worth looking at
|camera||Canon EOS 1300D|
|exposure mode||full manual|