ISO 1600 at 100 percent

At ISO 1600, even at small sizes, subjects look very soft and colors are a bit off (I've seen worse, though). Viewing it on an HDTV or at larger sizes on a computer screen will reveal a significant lack of detail, lots of noise, and yellow blotching. The 520 HS just isn't a good choice if you're going to regularly take photos indoors or in low-light conditions.