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On the moon with an f/15 Mak I find my 13mm LVW is very nice - 208X from an 180mm aperture - and at this power images are good with a hint of diffraction.
If the seeing is steady it can be worth dropping the 8mm LVW in for a closer look (338X) at the planets, esp. Jupiter or Saturn, but diffraction effects are obvious and the image a tad soft.
This would scale with focal ratio for other scopes, if using a set of LVW's - they are remarkably consistent eyepieces across the range.
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