Oh My Gosh! I was hoping for some nice binoculars to take on my once in a lifetime cruise to Alaska, but when I received these and got them all dialed into my eyesWOW! They are AWESOME! If you are like me as you are shopping for anything, you are comparing and reading reviews on websites and then on Amazongoing back and forth and making yourself crazy for dayslet me help you outSTOP SEARCHING! THESE ARE THE ONES YOU WANT PERIOD! This binoculars are absolutely crystal clear. I can't tell you all the engineering aspects or technical stuff, but I can tell you this: These binoculars are flat-out AMAZING! Even my husband was impressed and he is an engineer.