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Out of the two, 13 and 17mm, Stratus/Hyperion, the 13mm is a lot more useful in a 12" f/5 IMO. Enough field for all but a handful of objects and consistently more detail than the 17mm because of the increased magnification. And I also agree with Stephen that the 13 is also very capable on planets in a good barlow. A great EP for showing stuff to non-astronomers too.
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