If anyone owns the a580 camera in addition to the a99, could you comment on the iso differences as far as noise? e.g. a580 iso 1600 = a99 iso 3200. Samples side by side would be great! Thanks much in advance!
You should really check out the Sony SLT forums at dpreview.com. There have been extensive tests on this and the guys there could certainly help point you in the right direction. I don't have the a850, but I know my A99 is two stops better then my A77. I believe the advantage over the A900 and A850 came in around .5 to one full stop better in ISO performance, but again...www.dpreview.com Sony SLT forums for detailed info.