The following two 200% crops (enlarged using the “nearest neighbor” algorithm in Photoshop CS3) taken at 12.7 mm (equivalent to 60mm) demonstrate the decline in resolution going from F5.6 to F6.3:
| F5.6 |  |
| F6.3 |  |
As you can see, the text is more legible in the F5.6 crop. The conclusion is clear: if you set the F-stop on your Canon G9 above F5.6, you will lose resolution because of diffraction.
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