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My 8-24mm Televue zoom is mostly used for terrestrial vewing these days, but I have used it on comets with a small scope where I could subtly adjust the magnification to get the best contrast. It's also good for travelling.
However, due to the limited field of view (only an issue if you are used to good wide-field eyepieces, which I am!) it is very much an 'extra' in my bag, i.e. my prime eyepieces cover the same range.
I wouldn't pay megabucks for the Pentax version. As Casstony says above, a couple of decent eyepieces plus a standard zoom will probably serve you better.
Morton
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