If you have a small scope that you use for daytime as well as quick grab and go astro then a quality zoom can be a valuable addition to your collection. If you are doing longer sessions of just astro observing then you may be better served with fixed focal length eyepieces. I have a Tele Vue 24-8 that I recently got as part of a package. Haven't had a lot of use with it yet.
It can be useful to convert a small refractor into a spotting scope with an erecting prism if you want to use your scope in the daytime.
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