I use an iMac running O.S. 10.8.3 and iPhoto version 9.4.3. I also use Pixelmator 2.1.4.
I have been using a Sony A200 DSLR camera and have had no problems importing Raw files to either of the applications listed above.
However, when I started using a new Sony A58 SLT camera I could not import the Raw (ARW2.3) images.
I could see them as thumbnails on the camera but that was it.
Any solutions out there???
iMac, OS X Mountain Lion (10.8.2)
The Raw from every model of camera is different. Note: that's every model not every brand. So, the NEF produced by a Nikon D40 is not the same as the NEF produced by a D60, the CR2 produced by a Canon 350 is not the same as the CR2 produced by a Canon 400. Or, in your case the ARW produced by the A200 is not the same as the one produced by your A58. Therefore the Raw for every camera model needs to be added individually, for each model of camera and each brand.
Here's the list of supported cameras at this time:
http://support.apple.com/kb/HT5371?viewlocale=en_US&locale=en_US
As yours is not on the list the best you do is request the support:
iPhoto menu -> Provide iPhoto Feedback
Some folks have success on some cameras converting to DNG format using Adobe's ACR.
Sony arw 2.3 files and iPhoto
