M-17 Swan Nebula
One of the really cool things in Sagittarius to view in the summer. The nebula is kind of low in the sky, so it's hard to focus with the extra atmosphere. This is a quick shot I took, guiding is a little off, but I was happy that it turned out as well as it did!
I haven't used 1600 ISO too much, but it seems to do pretty good with the CLS filter, and much quicker to get the photons sucked down. I'll do some more experimenting with this setting.