Epiphytic 168 stack around 1.3x. I think Plagiothecium laetum but don't have the confidence level to call an identification. Partly because this individual is incompletely rehydrated, which complicates inspection of leaf margins.
It's attached with a 46 mm to RMS thread (0.800"-36, so named because Royal Microscopical Society boffins made it a microscope objective standard in 1858) step down ring from Joy's Optics. Most objectives use RMS so stepping rings are easy to source, though 46 mm anything tends to be trickier than 52+ mm.How is it attached?
I've not heard of anyone faking microscope objectives, though presumably it's been done. If my copy's a fake whoever did it also copied its near apochromaticity and ability to resolve submicron structures, so I think I don't care. At my nominal upper limit of 9.4x the subject size of pixels in 4k videos from post focus on Panasonic's 16 MP sensors is 500 nm. At 7.1x it's 633 nm, though both are below the objective's 520 nm lateral Abbe resolution of 867 nm. Not much on that scale here, though. Counting pixels and estimating angles suggests the leaf cells above are around 7 um thick. The smaller grit particles from the sidewalk are around 15 um.Is it real?