35 of 39 people found the following review helpful
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This review is from: Olympus Binocular 10x50 DPS-1 (Electronics)
In response to K. Gill's review... The 60-70 markings are there as a guide to aid the setting of the distance between the two barrels of the binocular, this is known as the interpupillary distance. The centre-to-centre distance between an adult person's eyes average between 60 to 70mm which is what these markings represent.
The goal is to have the center of the left and right eyepieces directly in front of the pupils of your left and right eyes. But people's eyes differ. Some are wide spaced and others are closer together. So binoculars are hinged to let you adjust the interpupillary distance to match the distance between the pupils of your eyes.
Hold the binocular up to your eyes and move the barrels closer together or farther apart until the two images become one circle.
When you see one circle, you have the interpupillary distance set correctly and the markings will then indicate exactly what your interpupillary distance is in millimetres. That's all there is to it.
As for the binoculars themselves, I cannot fault them and they are the best pair I've ever owned. I use them for looking at aircraft and for astronomy. They are also an ideal all round binocular for everyday use. They are of a quality finish and the pair I received are Olympus branded only, there is no sign of a Coleman logo on them anywhere! A top quality piece of kit 10/10!