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I use a Vixen 60mm F7 "subscope" as the finder on my 130mm refractor. I reckon I find things easier with this set up than with a 9x50 stellarvue finder fitted to my smaller 106mm scope.
This 60mm has all the same characteristics as a 15x spotting scope, ie an erecting prism and around a 3 degree field of view.
The only matter you may have to address is alignment with the main scope.
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