When companies release new camera models that are capable of capturing raw images (where the sensor saves the original image data as it was recorded, without compression or optimization), the raw format used by each is slightly (and annoyingly) different and proprietary. Apple incorporates support for the cameras at the system level, rolling them into bulk updates such as the recently released Digital Camera Raw Compatibility Update 3.1. This round adds support for the following cameras: Hasselblad H3DII-50, Leica M9, Leica X1, Olympus E-P1, Olympus E-P2, Panasonic Lumix DMC-GF1, Pentax K-7, Pentax K-x, Sony Alpha DSLR-A500, Sony Alpha DSLR-A550, Sony Alpha DSLR-A850. (Free update, 6.77 MB)
Mac OS X Zip Expanding Utility
Firefox (and possibly other applications) may ask you what you want to do with .zip archives that you download from the Internet. If you want to expand them with Mac OS X (rather than StuffIt Expander), you may be unsure of which application actually does the job. You're looking for Archive Utility (in Leopard and later) or BOMArchiveHelper (in Tiger). In either case, the application is stored in Hard Drive/System/Library/Core Services/. Don't move it from there, though, or you'll confuse matters.
Digital Camera Raw Compatibility Update 3.1
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