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Thread: Nitrogen vs Argon ES 82 degree EPs?

  1. #1
    Bigzmey's Avatar
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    Default Nitrogen vs Argon ES 82 degree EPs?



    I assume Nitrogen filled Explore Scientific 82 degree EPs are older but optically the same as Argon filled. Is this correct?

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    Default Re: Nitrogen vs Argon ES 82 degree EPs?

    Yup. Nitrogen purged are a bit older than the Argon. No differences at all in the optical quality. The only difference is that the Argon molecule is larger than the Nitrogen, thus will not escape the confines of the EP housing quite as readily.

    My 18mm is Nitrogen purged. The others are Argon.

    I'm just waiting on the Helium purged so I can tie my EP's to the end of my scope with a string.
    Bryan

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    Default Re: Nitrogen vs Argon ES 82 degree EPs?

    Quote Originally Posted by bladekeeper View Post
    Yup. Nitrogen purged are a bit older than the Argon. No differences at all in the optical quality. The only difference is that the Argon molecule is larger than the Nitrogen, thus will not escape the confines of the EP housing quite as readily.

    My 18mm is Nitrogen purged. The others are Argon.

    I'm just waiting on the Helium purged so I can tie my EP's to the end of my scope with a string.
    Lol, count me in
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    Default Re: Nitrogen vs Argon ES 82 degree EPs?

    Quote Originally Posted by bladekeeper View Post
    I'm just waiting on the Helium purged so I can tie my EP's to the end of my scope with a string.
    I think you're on to something there... my marketing instincts start working....
    Balance that top heavy dob with our new Helium infused eyepiece!
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    Moving on.......

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    Default Re: Nitrogen vs Argon ES 82 degree EPs?

    Or we could blend in some antigravity metals and reduce the weight so the eyepieces float.
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    Default Re: Nitrogen vs Argon ES 82 degree EPs?

    When ES first came out with the Nitrogen purged EP's I said "What"? By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases.

    So they are air filled? NBD.

    JJ
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    Default Re: Nitrogen vs Argon ES 82 degree EPs?

    The purging of EP's, Binoculars etc serves several purposes. The main one is the elimination of reactive gas. It is difficult for oxidation to take place in the absence of oxygen. The second is the purges are with dry gas -no water in the vessel to fog it up or go between the liquid and gaseous state to cause oxidation. Nitrogen (as N2) is good and stable but is reactive and can be quite acidic when it does so. Classified as a noble gas (have to admit that designation still tickles my sophomoric sense of humor) the advantage of Argon is it is inert, or will not react with anything. (At least at the temperatures & pressures night sky observers are likely to encounter) It's most common use is as a shielding gas for welding.
    Assuming a good sealing system the nitrogen purge will likely last at least lifetime, the Argon EP's should make it to the grand kids.
    It has always amazed me that Oxygen is so necessary but exacts a price over time.

    And just so we all know Bladekeeper knows his stuff.... the atomic weight of Nitrogen is 14 - Argon 40

    SKE
    Moving on.......

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    Default Re: Nitrogen vs Argon ES 82 degree EPs?

    Quote Originally Posted by sketrip View Post
    The purging of EP's, Binoculars etc serves several purposes. The main one is the elimination of reactive gas. It is difficult for oxidation to take place in the absence of oxygen. The second is the purges are with dry gas -no water in the vessel to fog it up or go between the liquid and gaseous state to cause oxidation. Nitrogen (as N2) is good and stable but is reactive and can be quite acidic when it does so. Classified as a noble gas (have to admit that designation still tickles my sophomoric sense of humor) the advantage of Argon is it is inert, or will not react with anything. (At least at the temperatures & pressures night sky observers are likely to encounter) It's most common use is as a shielding gas for welding.
    Assuming a good sealing system the nitrogen purge will likely last at least lifetime, the Argon EP's should make it to the grand kids.
    It has always amazed me that Oxygen is so necessary but exacts a price over time.

    And just so we all know Bladekeeper knows his stuff.... the atomic weight of Nitrogen is 14 - Argon 40

    SKE
    Argon is also used to cool the seeker heads on the AIM-9 Sidewinder missiles. I've swapped out many argon bottles on those rascals.

    Oh, and I checked first to see if that was classified. Don't want to get in trouble.

    Stupid top secret clearance...
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    Default Re: Nitrogen vs Argon ES 82 degree EPs?

    Quote Originally Posted by bladekeeper View Post
    I'm just waiting on the Helium purged so I can tie my EP's to the end of my scope with a string.
    I don't know but I have a vision of you traveling to a dark site in south america using those Helium purged eyepieces....

    up-xlarge.jpg

    Sorry about....I could't resist
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