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I have the Seben 8-24mm eyepiece and it is very good, having a good 60degree field of view at 8mm and not so good 40 degree FOV at 24mm. On the other hand I have an older 7-22mm no-name zoom that I wouldn't recommend, as it's fairly average.
By all means get something like the Seben one to muck around with (though you'll probably just be using highest and lowest power most of the time).
But for the same money at the Seben Ebay store you can get nearly four Orbinar Plossls or nearly three Orbinar Super Wideangle eyepieces or combination there of, which will give you better views than the zoom at lowish powers, and lower power than 24mm if you want it.
Regards,
Renato
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