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In May 2021 researchers in the Netherlands published a non-destructive neutron tomography study of a Leeuwenhoek microscope.[15] One image in particular shows a Stong/Mosolov-type spherical lens with a single short glass stem attached (Fig. 4). Such lenses are created by pulling an extremely thin glass filament, breaking the filament, and briefly fusing the filament end. The nuclear tomography article notes this lens creation method was first devised by Robert Hooke rather than Leeuwenhoek, which is ironic given Hooke’s subsequent surprise at Leeuwenhoek’s findings.
Correct, Hooke was first, Leeuwenhoek looked at microbes with it.