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The problem with short focal length EPs in general is that conditions rarely support their use. I hated spending money on anything shorter than 9mm. If I though I could use more magnification I simply Barlow a longer fl EP., say like a 9mm down to 4.5mm. Longer focal length EPs are generally more user friendly.
Of course the scope your using the EP on is a big factor.
If your already using a longer fl scope, say like a Cassegrain, sticking a short fl EP on them is almost guaranteed to make seeing much worse.
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