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Message: <blockquote data-quote="Binastro" data-source="post: 3243382" data-attributes="member: 111403">. The Orion 10×42 waterproof monocular in your link seems to be very useful and not expensive. I haven't tried that although I do have a zoom monocular, but optically it is poor.The zoom monocular is called Forest optics 10-25×42 waterproof zoom near focus 20 inches. It looks similar to the Orion 10×42 binocular. In fact there were two Forest optics monoculars at a sale price and I chose the zoom one. I should have chosen the fixed focus as I'm pretty sure that would be better optically.The zoom monocular has partly multicoated and partly single coated surfaces. I don't see any uncoated surfaces.I think that the Orion monoculars and the Forest optics monoculars are almost identical and come from the same factory and just have different names on them.P.S.At 10x or 12x the zoom  monocular can be used with glasses, at 15x and 25x not.The apparent field is small at 10x good at 25x.</blockquote>