Okay, so I noticed some of my images lately had some dirt in them ... and not just a little ... A LOT! I'm trying to figure out where its coming from, here's thing things I have tried so far. 1) Cleaning the sensor by lightly blowing air on it. 2) Cleaning the lens by lightly blowing air on it. 3) Cleaning the front of the lens with a mildly damp mico-cloth with warm water. So none of those did anything to help out ... and then I started to notice something, and here's what I think is super important. I've tried taking pictures without the lens on and I can't see the dirt. Now this doesn't mean its not there, because maybe its just so blurred I can't see it ... but that's a good sign. AlSO, the dirt is very very sharp at f/16 and then when I open it up to f/1.4 its near unnoticeable. Given those facts is it possible to nail down whether the dirt is on the sensor or the lens? I'm hoping its on the sensor as its a rather expensive camera to get sent in for repair and I don't know if I trust just *any* photoshop to work on it. If its the lens I can easily figure something out. Any help?