Blast furnace pipes at the former Homestead Steel Works in Pennsylvania.
When I saw these pipes and metal stencil labels, I knew I had to photograph them. Problem was they were about 2ft above my head and the light was fading. I bumped the cameras ISO up to 12,800 and took this shot. With a little noise reduction in Lightroom, the image is certainly usable online. I'm going to begin printing a few mid-sized test prints of images shot with high ISO's to see how well the Mark III noise translates to print.