Taking some photos, this morning, I found a dark spot I'd thought to have been an errant bit of dust on the lens had "returned." Found I had this: Cutting to the chase: It wasn't the lens and it wasn't the mirror. *sigh* Searched. Read. Carefully blew off the sensor with an air bulb, which got me this: "I can probably get the rest of that," I confidently thought. Oops Try again... Yikes! Again... *sigh*... Again... Grrrr... One more time... Closer. There may be hope! *argle* One. Last. Time. Almost as good as if I'd just left it at blowing it off. I guess I'll find a camera place that can do it properly.