I have about 10 different binoculars of different prices and sizes. There are several problems with these binoculars. First, I don't have to adjust the diopters differently on any of my other left-to-right pairs. Not only do I have to adjust them, but the setting seems to be out of range, leaving the left and right out of perfect sync. Also, the two sides don't seem to be aligned, so one side differs slightly from the other. I get headaches easily when using these binoculars. I would send them back but unfortunately I discarded the packaging they came in. I contacted Vortex directly and they immediately asked me to send them in for a replacement. Good service
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