I didn't like the panorama that originally filled this space, so I've substituted this more recent shot (Saturday morning, October 3rd) of that same scene, but an all-in-one. As I am getting more familiar with the Pentax X70 and its 24X optical zoom, I'm discovering that when it is set at 24X, like it was for this shot, there are dark patches in the four corners of uncropped images. This appears to be the faint peripheral image from the inside of the tube holding the telephoto lens elements. I can duplicate that same effect with the Canon G9 by not extending the zoom fully while its add-on doubler lens is in place on top of that. That's the clue that tipped me off to what's happening on this Pentax. The Pentax has a comparatively long set of extending tubes holding the lens system, and it is evidently taking a picture of part of one of those outer ones, at least in the corners of the frame, when the lens is set for maximum optical zoom. It can easily be cropped to eliminate that, but unless it is, there will be a darker 'shadow' effect in the corners. That's the price you pay for a whopping 24X optical zoom on a relatively small digital camera.
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