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This review is from: Black 9x50 Right-Angle Correct-Image Finder (Electronics)
On the advice of some other more experienced astronomers, I got one of these in addition to a Telrad to help me find my way around the night sky. So far, it's been a real bonus. The scope itself is sturdy, solid and well made. The view through the viewfinder is crisp and clear, although the focus is a bit fiddly - you have to unscrew a locking ring and rotate the objective to focus. Once that's done though, it's a breeze to use, and the right-angle makes it so much easier to see what your scope is pointed towards. Havign a correct image makes ita lot easier to navigate with star charts too, as what you see in the viewfinder is the right way up and the right way round, exactly as it is on the page. I wouldn't be without it now!