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So Joel, a focal reducer and/or a Barlow is NOT what you need. These are lenses which optically modify the focal ratio.
You need something much simpler. You need to get the sensor of your camera closer to or further away from the primary mirror. Further away is easy; you need an extension tube to put the camera further back. If the problem is that you AR not close enough to the primary, then you'll have to move the primary mirror up the tube a little. There are plenty of threads on IIS describing how to do that.
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