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Phillip
The main advantage of the 13 over the 12 is size, The 13 is not much larger than a 25mm plossl, so is a lovely lightweight high end EP.
Personally, I think 3 EPS is enough. I have 5, but really only 3 on any regular basis. If I was going to add one I would think about wider. In an 8" 125x is starting to push it. I found the 6mm Delos quite hard to use in my 12", mind you I find I have little patience for high power observing.
Malcolm
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