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Hi Francisco and welcome to IIS,
I won't give you a comprehensive answer but I'll try to point you in the right direction.
In the past, sensors with large pixels were much better than the ones with small ones, therefore one needed a large scope to get the optimum sampling.
These days the sensors have improved to the point that it is possible to achieve the same, or similar result with a smaller setup.
One important thing to keep in mind is that, if you shrink the scope, the star sizes don't shrink. Star size is determined by the f/ratio and not the focal length alone. Therefore the stars will be bigger/blobby with the smaller setup due to the fact that the pixels are smaller. That effect is somewhat compensated by the fact that the stars are not as bright in the smaller setup.
Hope that helps.
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