Diatoms imaged using the Raspail compound microscope body and the low-magnification objective. Note the spherical and chromatic aberration. Vignetting is due to the missing field lens.
Micrometer scale imaged using the low-magnification objective. The scale shows mm (eg., 0.6).
Diatoms imaged using the higher-magnification objective.
Micrometer scale imaged using the high-magnification objective. The smallest unit is 10µm.