Donde said:
Yes,
grab shot is a good description of one of the meanings of snapshot. Around forty years ago,when I was a kid, I remember reading that the original phrase snap shot (two words) was from bird hunting, and meant a shot made suddenly, with the gun brought up to the shoulder and fired quickly, in an instantaneous and fast manner. This is the type of shotgunning done quite often for grouse and quail, in a type of hunting called
jump shooting, which is different from say hunting birds that have been found out by pointing bird dogs, or shooting driven pheasants (British thing), or shooting "driven game", or
pass shooting of high-flying birds such as ducks or geese, but also pigeons or doves, or of shooting decoyed birds brought in to close range by decoys and calling; in other words, long ago a snap shot was a (gun)shot taken quickly, and without advanced preparation.
As I recall from the author of that article (Herbert Keppler maybe?) the photographic term
snapshot became a word only once cameras became capable of instantaneous, casual use. One does not make a snapshot using say, a full-plate or half-plate view camera with a 10-second exposure time and a Petzval lens....no...for the first fifty years or more in the history of photography, photographs were carefully planned, slowly-arranged, deliberate, and very much staged creations, and made rarely and with a lot of effort expended for each shot. Apparently, the term snap shot was shortened to one word, snapshot, and applied to photography only once making photos became easy, fast, and slow, groundglass focusing was eliminated as a necessity; the early Eastman "Kodak" pre-loaded, 100-shot, long-roll cameras were probably a key step in the transition from a 3-minute to 10-minute camera set-up process to the instantaneous ability to raise the camera, cursorily aim, and click!