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Hi David,
As Louie mentioned, the images shown are approximate simulations which only serve to demonstrate the size of a target in a "visual use" situation. It doesn't necessarily reflect the results that you're going to get photographically.
To give you an example, I've attached a photo of Saturn which I took last year using the very same 120mm refractor that was used in Louie's two image example. This was taken using a 4x barlow (for a focal length of 3600mm) and is a single 300ms exposure. It was my first attempt at planetary work and although not perfect, I feel that it does a reasonable job for the sake of this demonstration.
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