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I would keep the 16NT5 for use on a finder 'scope even the ST80 if you decide to use it for that purpose later. It will give you 25x and over 3 deg. field at over 3mm exit pupil in the ST80. I use one on my Stellarvue 80mm finder.
If you ever want the 16mm back it will likely cost you more to replace it. Meanwhile as you save for the ST80 keep sharing your current 'scope and the sky with your youngster to keep the interest.
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