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Excellent diagonal
As is normally the case in optics exceptional performance. This performs superbly optically, mechanically, and visually orientationally. The first two are obvious, but after years of struggling with telescope views being flipped and having to flip the iPad view or before that the mental gymnastics to look at printed charts... Looking at it now, this is inexpensive versus the impact it has had on my observing. And, it fixes all my telescopes.