I've shot long exposures on a point and shoot that can only go to F/8 as well, although limiting there are possibilities. With an overcast day early in the morning or late in the evening will give you minimal yet usable amounts of light. If you have a *fast* flowing stream rather than a calm one it won't take as long to blur the water properly. And the final solution that others have mentioned is get yourself a neutral density filter, something like this: [link] (I haven't used Tiffen filters and cannot speak to their quality) To which millimeter size you want, either get the smallest you can get away with (measure the diameter across the front of your lens) because that will be cheapest. Or keep in mind if you ever want to get a dSLR with that you may want to get a size that will fit your lenses in the feature should you choose to upgrade. Hope this helps Hope you get some silky smooth water shots soon!
The available apertures are F3.4, F3.5, F4.0, F4.5, F5.0, F5.6, F6.3, F7.1, F8.0 see page 67 in the english handbook.
The reason for that is that there is a relation between sensorsize and the maximal usable aperture typical values are Aperture 16-22 for 135mm Aperture 11-13 for APS.-C the relativ small sensor 1/2,3 inch would give you very blurred and unsharp pictures with aperture beyond 8.
This 8 will be nearly the same as an 16-22 at the 135mm format, so you get all of the Depth of field that is possible
The only way if there is to much light is to use a lower ISO-Value ora a a grey filter (i. e. Cokin )
Aperture is the size of the hole in your lens that allows light to pass through. The lower the F number the more open the the lens is. The more open the lens is the more light it lets in but also the smaller the depth of field is.
The available aperture settings are dependant on the lens itself and is a reflection of how much the lens can open up and how much it can close down.
If you were to buy a lens with a great capability to open up then you will be able to open it wider than 3.5. For example a 50mm F1.8 can open up to F1.8.
I haven't ever encountered a lens that is limited to not closing down farther than F8 though? Most lenses can close down to about F22. I have used some older lenses but max at about F16 but never as low as F8. What lens are you using? Perhaps there is something wrong with it?
I have one like that, but it's an Anthony and Scoville lens made in 1898. It stops down to f/256 too. Came with the wreckage of an Ansco vest pocket camera. I've been looking for a 6x9 plate camera I can mount it on.