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The amount you can magnify the image is determined by 2 factors.
1. The diameter of the scope.
2. The local "seeing" or air turbulance
Resolution of a scope is proportional to the diameter of the lens and the wavelength of the light. This becomes more important with smaller scopes like the one you have. With larger scopes the theoretical resolution of the scope is better than the local seeing will allow so the limiting factor with magnification is the "seeing".
At a certain size the scope becomes small enough that the scopes resolution is the limiting factor rather than the seeing. I forget what the actual value is and it will vary depending on the local seeing.
An 80mm scope will be limited by it's size rather than the seeing mostly. A 200mm scope will be seeing limited mostly.
A bigger scope will give you a brighter image but also will have the ability to resolve more detail when the seeing is good.
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