Electron microscope observations? Echograms? What's the most exotic imaging tech you've seen in an observation?

[broacher]

I was just wondering.

We talk a lot about exotic species and locations, but what are the exotic observation technologies that have been used in iNat postings?

[tallastro]

I think I heard of someone using a light sensitive chemical emulsion to capture images of organisms.

[cbirds22]

Maybe not the most exotic, but thermal imaging is certainly interesting.

[lgarriga]

Well there’s @joemdo that frequently uses spectrograms for bat observations in my area, but other than that I haven’t really seen too many exotic observation methods.