Sometimes i take pictures at hi iso, 6400-12800, ye its a mess of noise, but it doesn't bother me. I only worried about one thing, purple dot at the bottom of photo. Take a look:
This whole black bag is black, but at the bottom its purple O_o
You can see better on uncleaned raw:
so, my question is, do you all have a lot of noise at the bottom of photo on hi iso? Or my sensor is bad?