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Diatomee in campo oscuro: Klaus D. Kemp 8 Form test plate. Dal sito di riferimento: "for testing objectives, contains the following species, Amphipleura pellucida, Frustulia rhomboides, Pleurosigma angulatum, Surirella gemma, Nitzshia sigma, Stauroneis phoenicenteron, Navicula lyra, Gyrosigma balticum." L'ultima, ma forse anche le ultime due, si riescono (forse) a risolvere solo con un obiettivo 100x in immersione in olio, con ingrandimento intorno ai 1000x.
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