Dave,
Quote:
which is a Meade x2 #140 apo
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Rob,
You'll love a 5x powermate, it's much better than stacked barlows and the good thing is you can add extension tubes to increase the focal length.
Matt,
Get a 2.5x powermate, if you insist on a powermate. There are other (cheaper) 2x barlows that are 90% as good at 40% of the price. You just won't use anything higher than a 3x for visual, so I wouldn't go for a 4x powermate unless you plan on using it for imaging with the C925, as the 5x would probably be too much FL on most nights given the seeing conditions.