Sounds good, except f/3.5 is bigger than f/8, so actually f/3.5-5.6 is the MAXimum aperture of the Canon kit lens.
The pentax Optio it seems to me is a P&S camera. With only a few exceptions, these cameras have an absolute minimum aperture of f/8. There are a couple that go to f/11.
Remember, f-stops are a ratio or a fraction (same thing), so just as 1/2 is a bigger peice of pie than 1/8, f/2 is a bigger aperture than f/8.
These numbers apply only as a ratio, and as the lens gets bigger, a bigger hole is required to keep that fraction balanced.
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