Supposing the image is of photons and not of electrons you will have to consider that any equipment that is attached to a microscope probably triples in price due to being in a lab environment. So any electronic camera equipment will be bought as cheaply as possible meaning no color. And color is not as important when you publish in science magazines.

Ongoing 'scope debate
 

http://www.sandia.gov/mstc/micromach...ery/Bug_2e.jpg

The lettering at the bottom indicates that this image was taken with a scanning electron microscope.
See "20KV"? that is the equivalent of brightness.

The moving pics look more like polarized light to me.

Thems mites is good eatin'!

I fear you're slowing down in your old age Toad. :)