I forget the details now, but a couple weeks ago I had the Canon on a tripod and snapped two identical, unedited photos of the reflection in the kitchen window above the sink. One was f/2.8 and one was F/11 (as I recall). One shows the reflection and counterto items in good and clean definition, and the other has a more shallow depth of field and a more blurry reflection and items. Click to enlarge and see. With the camera automatically making all other adjustments (this is Av or aperture priorty mode, where I select only the aperture), the two photos seem otherwise identical,---that is, no major changes in light quality or shadows.