i’ve got a 3″ newtonian.
it’s enough to see the moons of jupiter, the orion nebula, that sort of thing.
but…
it’s not enough to see any detail on jupiter – it’s just a small white blob, with teeny tiny white blobs next to it.
it’s cheap, and very flexible/wobbly. it’s not very easy to aim/position*. it’s actually quite frustrating to use, unless your daughter is the geekiest 8yr old ever, i can imagine her getting bored quickly.
(*partly because it’s so cheap/simple, partly because of the inherant ‘everything-is-upside-down-and-back-to-front-left-is-right-up-is-down’ mind twisting nature of the newtonian)
imho, the optics in a newtonian are quite simple/cheap. the optics in my cheap telescope are much better than the wobbly stand, and the shonky aiming performance.
i’m off to the kielder observatory in a few weeks!