Thomas gave a 2-hour presentation to our photo group here in Tulsa this past summer. He's quite an interesting character to say the least.
Interestingly enough, he doesn't give a hoot about what the gear is and has zero real interest in "photography" per se, nor is he an entomologist. His "serious art" is here:
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He is honest to goodness a portraitist when it comes to his arthropod micro-photo work. He finds them incredibly beautiful and simply want to make the best pictures of them he can. He spends more time composing the frame, checking his background and ambient light for a single shot (usually over a dozen frames per image) of a jumping spider than most of us give to an entire people portrait session.
And get this - he doesn't use a tripod; I don't think he even owns one. All of those photos are handheld, most of them made with him belly in the dirt/weeds, like a Marine sniper, patiently waiting for the bug/s to calm down and forget there's a 50mm lens a couple centimeters from their compound eyeballs. He fires off a couple dozen or more shots varying the focus point and then stacks the exposures in photoshop. Other than the stacking he does very very little post processing. He feels it is imperative he present the arthropods as accurately as possible because many of his photos are used by the entomological community.
He buys Pentax because he can get lenses on the cheap. None of his lenses cost him more than $50 and he has DIY'd most of his extension tubes & flash setup. He doesn't talk gear, doesn't even talk photography; all he talks about are the arthropods.
His astrophotography skills are stellar as well (pardon the pun).