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Thread: putting my new eyepiece next to a bright light source

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    Default putting my new eyepiece next to a bright light source



    hello everyone - I purchased a 6mm eyepiece on the used market in like new condition couple of weeks ago. Unfortunately i did not get the chance to use it yet but today I did some inspection to check its condition.

    When I put it close to a bright light source , e.g light bulb and place my eyes from a distance aprox 30 cm away, I see lots of small illuminating little bright dots that looks like stars or tiny christmas ornaments. is this normal ? is it dust thats getting illuminated ?

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    Default Re: putting my new eyepiece next to a bright light source

    Can you tell if those dots are on the surface (likely not a problem) or inside (possibly a problem)?
    Also, there are old basic rules in astronomy: never look through your eye piece next to a bright light, and never aim a flashlight at your mirror. Nothing good can come out of either...
    jerryTheC, DeanD, Lowjiber and 1 others like this.
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    Default Re: putting my new eyepiece next to a bright light source

    They seem to be on the inside. They are really tiny pin point of lights

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    Default Re: putting my new eyepiece next to a bright light source

    I just cleaned the back lens , i.e the lens that gets into the focuser. The small dots of lights seemed to have decreased.

    some back story : this eyepiece was kept new for the past few years by the original owner and never opened. When I got it, I saw a little bit of humidity on the top lens which I was able to clean easily. I did not expect the back lens would accumulate any sort of humidity too.

    Anyway, it looks like it did and after cleaning it gently , those bright dots seemed to have decreased
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    Default Re: putting my new eyepiece next to a bright light source

    Hello Mruhomau,

    the dots you have seen may come from the cheaply anodized tube interior of the EP.
    This is not totally uncommon.
    You should get the EP interior and the lens surfaces cleaned.

    Best,

    JG
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    Default Re: putting my new eyepiece next to a bright light source

    I cleaned up the lens, and I am not able to get rid of the "ornaments " . I took some photos to the best of my ability. Can someone confirm what Im I seeing or whether this is normal ?

    Attachment 185415Attachment 185416

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    Default Re: putting my new eyepiece next to a bright light source


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    Default Re: putting my new eyepiece next to a bright light source

    Quote Originally Posted by mruhomau View Post
    I cleaned up the lens, and I am not able to get rid of the "ornaments " . I took some photos to the best of my ability. Can someone confirm what Im I seeing or whether this is normal ?

    Attachment 185415Attachment 185416
    Hello Mruhomau,

    that's definitely not normal, and it is even much worse than in my collectible old Zeiss O-16 Abbe ortho, and these have suffered from inner dust release.

    For you, this would mean to take the EP apart, and to clean the inner surfaces.
    Otherwise, give it away.

    Sorry for the bad news,

    JG
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    Default Re: putting my new eyepiece next to a bright light source

    I agree with JG on these. I've seen man with a small specklings of dust which typically don't effect the viewing, but those look mighty unnatural. I even wonder if that may actually be some sort of paint or metallic material from the inside of the EP that is delaminating in some way. But yes, it looks as they could use a disassembly.
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    Default Re: putting my new eyepiece next to a bright light source

    When I have borked eyepieces I sometimes try to salvage usable parts for other EP's. Many of the drawtubes on eyepieces I regularly use came from old eyepieces that had visible debris in the field of view.



    The drawtube on this Vixen NPL (above right) was originally from a William Optics eyepiece that had debris in its field of view. The filter thread in the original Vixen was dodgy.
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