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I've been holding back waiting for a more skilled/critical observer to comment but since none has here's my opinion; the modern zooms are good enough that I wouldn't be without one for the convenience. I've used a william optics/proxima 8-24mm and a vixen 8-24mm and they both looked about as sharp as a plossl to me. The vixen may be a little soft at 8mm. Before accumulating the Nagler, Panoptic and LVW I have now, I used the zoom for most of my observing though now it mainly gets used in my PST.
The new Hyperion zoom is getting good reports and may be worth looking at, though I don't like the look of the eyecup (personal preference - I like a narrow eyecup rather than a wide one).
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