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Yep 3x is more likely the best solution to this problem. I use the 2x regularly, with the filter wheel acting as an extension and this gives me very large image scales. The 3x with your native focal length would be fine and get you up to near 4x meaning a focal length of 7315mm. With a small extension you could get it up near 10,000mm. I could loan you a 3x to see if this will work and it not at least you would know without spend more money than necessary.
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