I had just finished capturing some images of the Moon with the EdgeHD 9.25" and Canon 6D2 (it fits the Moon in frame with little vertical room to spare). The seeing was much, much better than the 'predicted' poor seeing. I'd checked the 'stars' to see if it was going to be worth the effort to drag everything out and setup.
I think I got some of the 'gravel' from the crater in the imaging train, LOL. Seeing the entire frame of the sensor illuminated brought out all the specs of dirt on the sensor and 'dust' donuts further up in the imaging train.