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I have a 16"F 4.5, my most used eyepiece is my 13mm Nagler which gives a mag of 140x.
If your 16" is F 4.5? a 9mm will give around 200xmag, I do supernova searching so I am not exactly looking at the galaxy but the possible star in it.
If you want to view with reasonable mag and a good field 13-15 mm eyepiece is a good size one to use.
It all depends what kind of observing you want to do.
Ron
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