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    Default Collimation question (Meade 9x63)



    Good Day, Everyone.
    I've just got hold of a Meade 9x63 that is badly out of collimation. Something in the right hand body rattled slightly and both I and the person I got it from suspect that is one of the prisms. A quick look shows that somebody had tried to climate the right hand part - the rubber armour wasn't adhering fully and one of the collimation screws was loose. Further inspection reveaed that the left hand exit pupil is slightly cats-eye shaped. The images in the eyepieces diverge laterally and the right eye image is higher than the left eye image; I guess there's about a 30░ slope between them.

    Tightening up the collimation screw until i feel resistance seems to have stopped the rattling. However, I am reluctant to do any further adjustment without knowing what the resistance is. So my question is, can I expect to feel a reasonable amount of resistance when I tighten the collimation screws or should they feel fairly light? Or have I got the end stop. I'd hate to turn the thing and find bits of crumbling prism floating about inside! :'(

    Thank you.
    Celestron XLT-102, Vixen R130sf
    CG-4, Porta Mount II
    Celestron Skymaster 15x70, Bresser 8x56, Kepler Optic 10x50

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    Default Re: Collimation question (Meade 9x63)

    It sounds to me like the binos are too far gone for merely adjusting the collimation screws. If the prism is rattling around, you need to open it up and fix the problem. If you are not comfortable doing it yourself, take it to a good optical repair shop.

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    Stuart Bruff's Avatar
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    Default Re: Collimation question (Meade 9x63)

    Quote Originally Posted by KeithBC View Post
    It sounds to me like the binos and they are too far gone for merely adjusting the collimation screws. If the prism is rattling around, you need to open it up and fix the problem.
    I did think that initially, Keith, but the fact that the rattling stopped when I turned the collimation screw in gave me some mild hope that I could continue to make adjustments, especially as the similar "loose" feeling on the left side had no apparent effect of the left image position and didn't result in any change in the non-circular exit pupil. i've no experience of collimating binoculars and hence have idea what I should be feeling in terms of screw resistance.

    If you are not comfortable doing it yourself, take it to a good optical repair shop.
    Given how much I didn't pay for them, their actual value and the likely cost of repair, I suspect I'd be better off blanking one eyepiece or ebaying them. :-)
    Celestron XLT-102, Vixen R130sf
    CG-4, Porta Mount II
    Celestron Skymaster 15x70, Bresser 8x56, Kepler Optic 10x50

 

 

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