White LCD Screen
as shot or
enhanced via PS auto-tone
Choose View: original resized (can't see much) ... or actual pixels cropped showing dust bunny!
Choose F-Stop: 5.6 - 8.0 - 10 - 16 - 22 - 32
Conclusion: Dust on the camera sensor looks scary, especially in the enhanced images. It would have been nice if the brand new Canon 7D had shipped with no dust ... but looks like there are a couple of 'em there - there's another similar "large" one at another spot. However, if you flip to the as-shot images, they are barely visible, even at extremely small apertures. So for most real-life shooting, they aren't significant, so I'm not going to worry about it for now ... and HECK, over time, they might just go away!
BTW, one thing that is quite noticeable is how much vigenetting the 55-250 lens has, even at F/8.0 and especially wide-open at F/5.6. This is a very light/small $250 lens, so you get what you pay for, and while it's a great bargain, keep this in mind when shooting with it.