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The 70mm is exactly what I used as a finder on my scopes.
I used a 20mm 70º double cross hair eypiece that gave 2.7º TFOV. Can get 3.5º or close enough TFOV with a 24mm 68º eyepiece.
A tiny bit of field curvature with this scope and 20mm eyepiece, not enough to be a nusance. I had it with guidscope rings. The worst part is the plastic focuser but as it only had one eyepiece in it that was fine too.
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