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Thread: New binoculars must do's

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    Default Re: New binoculars must do's



    Quote Originally Posted by j.gardavsky View Post
    Hello Sean,

    here is an easy-to-do daylight test on the collimation (alignment of optics) of the binoculars,
    Binoculars: A Question of Alignment

    Best,

    JG
    Thank you I will try that tomorrow
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    Default Re: New binoculars must do's

    Quote Originally Posted by jaetea View Post
    An 8X40 pair of binoculars is a great place to start. The method of using a lens cap was describing how you focus the binoculars when they have a diopter adjustment for one eye. You put the lens cap over the side of the binocular, typically the right side, that has the diopter adjustment then focus the binoculars using the binocular focus system to get the left eye perfect. At that point you swap the lens cover over to the left side and if it is out of focus for your right eye then you use the diopter adjustment usually a ring around the eyepiece to bring that image into perfect focus. Once you've done this you shouldn't need to do it again unless you hand your binoculars to somebody else and they mess with it.

    Cheers,
    JT
    Thank you for that explanation I will make sure to do this tomorrow

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    Default Re: New binoculars must do's

    My 15x70s were badly out of collimation when I got them. I couldn't tell much by looking at extended daytime objects like a cell tower, but when I took them out at night and looked at stars (point sources), there were widely separated double images.

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    Default Re: New binoculars must do's

    Quote Originally Posted by jcj380 View Post
    My 15x70s were badly out of collimation when I got them. I couldn't tell much by looking at extended daytime objects like a cell tower, but when I took them out at night and looked at stars (point sources), there were widely separated double images.
    I have checked them during day time and everything seems fine. But as many as you state it isn't until you point towards the stars will it truly reveal itself. If it wasn't for these forbidden clouds over my house that wouldn't be a problem to check
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    Default Re: New binoculars must do's

    The other thing with binoculars is that the view of distant objects should not look like the figure-eight they always show in the movies. The image for each eye should overlap perfectly so you see a circular image of distant objects without any eye strain. When you focus closer you will find the image tends to look more like the "movie" figure-eight view. This is simply due to the parallax effect of having eyes that are separate! (The closer the object, the bigger the parallax. This, by the way, is how we manage to see things in 3D and are able to tell that some things are closer or further than others, which is a pretty good thing really. ))
    To get the best view of distant objects you need to adjust the inter-ocular distance (ie: eye spacing) until you get that circular overlap: this means twisting the two sides together or apart as you are looking through them until everything comfortably aligns. We all have slightly different distances between our eyes, so when someone else looks through your binos they will have to twist them in or out to achieve the right spacing for their eyes: and you will have to re-adjust them for yourself. This takes less than a second when you know what you are doing, and becomes automatic.

    Good luck with your binos, and enjoy!

    - Dean
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