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I'm guessing the focal length is about 600mm, in which case I would be getting one of the tmb planetaries advertised on this site, I have the 6mm and they are great value IMO. The 4 or 6mmm would suite, giving either 150 or 1oox magnification.(150x is pushing it a bit, not for planets but other objects) Also there is a 5mm radian on eBay at then moment for 150, a good price for a better planetary ep.
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