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S2 (Style System 2) is an object-oriented programming language developed in the late 1990s by Brad Fitzpatrick, Martin "Mart" Atkins, and others for the picture-hosting website code FotoBilder as well as the online journalling service LiveJournal in order to allow users full control over the appearance of their pages.
S2 source code is compiled into Perl, which the webserver can then execute directly for individual web page requests.
A distinguishing feature of S2 is that source code is organised into individual layers, of which there are six different types (core, i18nc, layout, i18n, theme and user).
Surprisingly there is no vertical shutter release on the S2 Pro, and the position where one would normally be located is taken by the holder space for the two CR-123A lithium batteries used to power the flash and autofocus.
Battery power on the S2 Pro is provided by both 4 AA cells in a removable tray in the base and also 2 CR-123A batteries.
What I see from the S2 are lovely, clean images that up to ISO 400 are comparable to those from the Canon 10D, but at higher ISOs and very long exposure times the newer Canon has a slight the edge because of lower noise.