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I had a cheap pair of them, gave me headaches. One lens was way different than the other all the time, no matter how you adjusted it. Maybe I just got a bad pair.
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I had the same problem. They were the buckhorns mentioned. I think they were $100. They were great for about 6 months, then something went wrong with one lense. If you look through them for more than 5 seconds, you feel like your head could explode at any minute. Bushnell would not back them. So I through them away and spent $300 on Nikons. Best money I've spent and they back them for 25 years.