Light microscope video, mixture of incident and transmitted light:
head region of Milnesium tardigradum in natural movement. Only the light microscope
is able to reveal the inner bucchal anatomy and the eyes with their transparent lenses (!)
above the eye pigment.
The SEM electrons would be stopped from penetrating in this scenario immediately after
having passed the first few microns of the cuticula. As a consequence they cannot depict
the eye pigment situated below this cuticula.
Last but not least you will not come across SEM live videos in the internet, as the tardigrades
would have to be filmed in water - and water cannot be penetrated by electrons either.
In contrast an ordinary light microscope can provide live videos of tardigrade birth, of the cell divisions in the egg,
of nerves and muscles, of the moulting process, the deposition of the eggs, the desiccation and awakening
of the tardigrades and much more.