ISO 25,600 picture was at F4 and 1/1250th of a second since it was still dusk. I could have afforded double the shutter to brighten it up but that was after my brain kicked in. LOL But if you click the picture and zoom in with the Flickr website, you'll see the detail is still there and the noise is pretty uniform without softening the edges. So not bad! Rather it's marvelous!