Daylight motion shots

Was wondering if anybody could give me some advice on what type of ND filter id need to be able to set a shutter speed of between 2sec 1/2 of a sec. Im trying to shoot motion shots in mid daylight at iso50. Note i think the nd filter on the G6 is about 2stops but its not enough.

Based on the F16 sunny rule, at f16, and iso50, shutter speed should be 1/50 of a sec. So since G6 is only at f8 maximum that is 2 stops more light so shutter speed will be 1/200. Is it possible to mountre ND filters to bring the shutter speed down to 1 or 2 secs while aperture is f5.6-f8?

Any suggestions. 1) Id seriously like to get 2sec or so in using the internal ND filter on the camera with an add on filter and hence get a slow shutter speed. 2) when the ND filter is attached but the internal ND Filter is off slow but slightly faster shutter speed

After specifics in ND stop amount required.

The ND filter on the G-Series is actually 3 stops. Even with that, its pretty tough to get the kind of shutter speeds you're looking for in daylight using just the built-in filter. The photo below was taken with the built-in ND filter in bright daylight that was "filtered" by trees. The best I could do was 1/8 sec. at f8.

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One of the advantages of living in the UK is that we get a lot of cloudy days! This was taken 1 sec at f8. I used the built in ND - but was also under a lot of tree cover.

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There great photos.

The kind of photos i was looking at creating included

1)motion city shots with the hussle and bussle of local commuter and pedestrian traffic.

2)and wildlife / nature based shots like the water photos presented below. Except being able to do motion shots on a bright sunnys day is what im trying to achieve which would then give me extended shutter speed capabilities on cloudier days.

Thanks for the example photos, so ill probably need an ND filter with another 3 - 4 stops, do you agree?

Yes, at least 4 stops. Assuming "sunny 16", you're at f/8 1/200 with nothing, f/8 1/30 at 3x ND built-in, and you'll need 4 more stops (ND value of 1.2 = ND4X) to get to 1/2 sec. (1/15, 1/8, 1/4, 1/2.)