Franz. Your right, but I think the last two are better than the others.
The others are made with a 4x lens and the oblique light doesn't work so well with this lens.
Another reason is, I take the pictures with about 0.3 seconds, I use no flash, and the organism is constantly moving.
And maybe the most important thing, my microscope Byomic BYO-500T costs new in the box only about 500 euro's so it's not a Leica from 5000.
But I'm very happy with this thing. And using some cheap home-made filters etc. I'm mostly satisfied with the results. And please, no hard feelings. Every comment, positiv or negativ is welcome.

Byomic BYO500T microscope /CIOC XDS-1 invert.
Byomic ST-340 stereomicroscope
Olympus BHM Metallurgical Microscope
Canon EOS 7D Mark II / Canon MP-E65
Cognisys StackShot
www.ngvm.nl