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i wanted a 2.5 powermate ($180USD) but didnt want to spend that, from my understanding the powermate loses X as you increase the distance, so with my 2" diagonal and webcam setup i wouldnt of got 2.5X anyway- more like 2.25X- i opted for the GSO 2.5X at $49 USD, its a 3 element APO barlow, i was worried about the super cheap price but ordered it anyway- im glad i did!!-it out performs my ultima 2X barlow, very well color corrected and sharper, so the powermate isnt even on my mind anymore
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