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.
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.
Not sure these are moss colonies either. Would need more pixels to tell if they're something else or just really pushing setae.
You are correct, the growth is on a rose hip.
Dew or captured fog. Hard to tell at that colony's particular location, though from the perspective of maintaining exohydry it's kind of an ambiguous distinction.
For those disinclined to watch videos this is a self-promotional link to a Panasonic G9 autofocus evaluation relevant to Ralf's animal detect thread but unrelated to this thread. The halophytic mosses Bryum capilare and Didymodon rigidulus might be present adjacent to Moss Landing in Elkhorn Slough but are not shown in the video and are absent from the local species list (Elkhorn is usually described as an estuary rather than a swamp, consistent with its limited number of trees, and Moss Landing gets its name from a wealthy man rather than a botanical source).
