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You'll find it just doesn't work that well. The key is in the focal length, not the aperture here. Take an 8" f/6, with F=1200mm, and an 8" f/4, with F=800mm. A 25mm eyepiece will give you 48x and 32x respectively. A 6mm would give you 200x and 133.3x respectively. No amount of barlowing is going to get you around that. I have seen scopes pushed well beyond their limits and basically the image is rubbish. If its high quality optics, maybe it will be ok, but generally not.
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