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Most Barlows work like this, the cheaper ones at least (that aren't set up to be equal mag with back spacing). I have an Bintel 8x50 RACI finder, and can spot Uranus quite easily with it (when the moon isn't too full). For Neptune I need a star map (I use SkySafari) to put me in the right location, then just slew around until I find something that looks about right.
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