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As the others have said, your resolution and light gathering capacity will stay the same, but having such a long focal length means your FoV will change and with so little light gathering capacity in the first place, with such a restricted FoV, the images will be dim. As some have said, best to use a barlow to do the trick, but for a good quality one, you'd be paying more than the scope's worth. To do it the other way means your tube is going to be 1 metre long, or larger. You'd have to make it out of carbon fibre to keep it rigid enough not to obstruct your viewing.
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