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>>247627 On many P&S's, it's just a built in ND filter that flips in place. My A550's is measured at around 3 stops so it goes from 2.6-7.1. The only way to change aperture is by zooming in.
Here are the comparison shots while I was helping port CHDK. The firmware would just round up or down the inputted value to decide whether or not to use the ND filter. It was fixed in the latest port.
Camera-Specific Properties:Camera SoftwareAdobe Photoshop CS3 WindowsImage-Specific Properties:Image OrientationTop, Left-HandHorizontal Resolution180 dpiVertical Resolution180 dpiImage Created2008:03:18 18:49:52Color Space InformationsRGBImage Width640Image Height480
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