>...In terms of high ISO, I question whether or not my camera is >working right, because my images look awful at 12,800 and >upwards. I can use some help with that for sure...
So how are you processing the images? Any noise reduction?
I shoot RAW only and use Lightroom, which includes some noise reduction. I can get useful pictures at 12800 and 25K with some noise reduction. At 50K and up it takes a lot of noise reduction and even some downsampling. PhotoShop might help out but I haven't had the camera long enough to try it out.
There are other noise reduction programs out there but I haven't tried any yet.