Quote - Actually FFs will not go away with longer rendering. In fact they can get worse. There is a difference between FFs and render noise, they are not the same. FFs are caused, generally, by a combination of overlighting and glossiness set too high. With glossiness I mean thet combination of specular and glossiness strength. Those two should always worked together. Render noise is just a function of the render not having enough data. There are many ways of optimizing the scene to make it render faster. Of course it all comes down to processor speed. Having a modern quad-core or higher will help greatly. 

Cheers.

This is a very good point that does tend to cause some confusion in what went wrong during a render.

FFs are areas that are out of range (blown out), and subsequent sampling only compounds the problem. Thats why it continues to get worse.

Render noise is almost always a lack of data causing the calculations to be within range, but not what they should be. This can have many causes, but usually stems from a incorrect color creeping into the calculations somewhere. A hole in the enviroment (or lack of) that the render engine can see in one of the calculations is just one example.

Trade offs have to made sometimes, but knowing what caused the problem in the is the key to getting around it.

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