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I was going to get a 2.5x Powermate (5x is pretty much useless for visual in a 1200mm FL scope). But now I'm looking at keeping my Stratus EPs and they have FLs: 21, 13, 8, 5mm.
With the Powermate they would give effective FLs of 8.4, 5.2 and near useless 3.2mm and completely useless 2mm. So 2.5x is no good because the useful barlowed (p-mated) FLs are almost the same as those of my other EPs. I'd be better off with a 2x barlow.
That will allow me to have a two more mags to fill the gaps between the 13, 8 & 5mm and will also give a useful mag with the 8mm. And it will have to be a barlow because there is no way I'm paying $450 for a 2" P-mate. (UO 2" barlow I think. Shorty-plus is too awkward & scary with these big heavy EPs.)
My long-winded point is that what magnification barlow/powermate will suit you depends on what FL EPs you will be using it with.
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