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Ultimately I would skip the barlow, I prefer not to add more glass between my ep and the object., but they are well priced and can be useful. They make the planet bigger through increasing mag but you do lose detail. If it was me I would get a 5mm TMB, this would get you 240x, a nice usable mag for planets and the moon.
Remember that Jupiter is in opposition in Nov-Dec and an 8" Newt with a 5mm TMB will give you a super view!
All the best.
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