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Thread: ? for anyone with an ES 82 degree 14mm

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    Default ? for anyone with an ES 82 degree 14mm



    I really should have approached this with ES before (they are currently looking into it for me) but when I use my 14mm eyepiece I see significant EOFB. I see it a little bit in my 11mm also but it is most noticeable in the 14mm. I took the eyepiece to my ammo reloading bench where I have very good lighting and used a magnifying headset to look for a reason. What I found and what I think may be the cause is that the edge of the ocular glass (closest to the eye) is not blackened in either of these eyepieces. My theory is that I'm getting light reflection from the edge. The following picture shows what I'm talking about.
    2016-12-13 08.15.07-1.jpg

    If you own this eyepiece, please let me know if yours is blackened and if not, if you have EOFB when using it.
    Dennis. ~ 45 years of astronomy and not giving up anytime soon!
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    Default Re: ? for anyone with an ES 82 degree 14mm

    Hi Dennis. I have this eyepiece and have not noted any EOFB. I don't know if the edge is blackened or not, but I'll be sure to check this out on my lunch hour and report back to you here.

    My primary use of this eyepiece has been with my 12" dob. I've not had much opportunity to utilize it with my 5" refractor yet.
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    Default Re: ? for anyone with an ES 82 degree 14mm

    I use the ES 82° 14mm on my 9.25 Evo and I have noticed some edge brightness as well. While I was checking into it I found a post that has some discussion of edge brightness in general that may be interesting just in case you haven't seen it: Possible Explanation for Edge of Field Brightening - Eyepieces - Cloudy Nights

    The edge brightness I see is most obvious when I'm looking at the center of the field and seems to be much less noticeable when I direct my attention to the edge of the field which may not be what you're talking about. It's especially noticeable when in my backyard and LP is an issue, much less so at a dark site.

    I looked at your picture and my eyepiece and I'm not sure what I should be looking at to tell if the edges are blackened or not. I can't see any difference in the picture you posted and my eyepiece.

    I have noticed many people consider the 14 the weakest of the 82° series but they usually mention the flatness of the field, or lack of, as the reason. I'm very happy with mine but I only own the 14 and 30mm ES 82's for comparason. Looking to get the 11 soon.
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    Default Re: ? for anyone with an ES 82 degree 14mm

    I once considered the 14mm but also read many times that it was weakest of the 82° bunch. I passed on it since I already had the 11mm and at the time 14 was not on sale, nor is it part of the current sale either. If it goes on sale again I maaaaaaaaaaaay reconsider it

    Good luck
    Abb
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    Default Re: ? for anyone with an ES 82 degree 14mm

    I have two of 'em. Neither has the white "band" that is clearly evident in yours.



    Okay! I'll admit it took me a minute to figure out what EOFB was.
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    Default Re: ? for anyone with an ES 82 degree 14mm

    I've not noticed any issue with my ES82s - but I'm certainly going to check them all now! Yours certainly does not look blackened.
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    Default Re: ? for anyone with an ES 82 degree 14mm

    Thanks John, it certainly appears that the edges are blackened in your eyepieces. The EOFB in mine is enough to be distracting from the view even when concentrating on the center of the FOV. My thinking is that maybe I got one that slipped through without being blackened.

    I examined all my ES eyepieces and the 14mm and 11mm are the only 2 that I see with the non-blackened edge (or at least that I can see the edge).
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    Default Re: ? for anyone with an ES 82 degree 14mm

    Hello all,

    in the advanced optics designs, they often don't blacken the lens rims, but prevent the vagabonding light rays with baffles. You can make back and forward ray tracing with a low power laser pointer to see what's on, but protect carefully your eyes.
    The green laser light eventually reveals also problems on the multicoatings (uneven distributed light on the spot of the laser beam impact on the lens surface), 'milky' trace of the light scattered on the microinclusions in the glass material. It is sometimes better to not know, though.

    Best,

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    Default Re: ? for anyone with an ES 82 degree 14mm

    Quote Originally Posted by bikerdib View Post
    I examined all my ES eyepieces and the 14mm and 11mm are the only 2 that I see with the non-blackened edge (or at least that I can see the edge).
    Since you mentioned the 11mm EP, curiosity got the best of me so I pulled out my 11mm. As far as I can tell the edge on mine is blackened. Now my 11mm is an older Nitrogen EP as opposed to the current Argon ones........

    Abb
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    Default Re: ? for anyone with an ES 82 degree 14mm

    Thanks JG, at this point I'm going to leave it up to ES. They said they just got a shipment of 82 degree 14mm in (they had been sold out) and they would pull one and investigate further. Maybe a couple of eyepieces with green paint will find a way into my case to fill these 2 spots? They would feel at home with the other green paint already in place in my case. Don't get me wrong, I like the ES eyepieces and own several that will NEVER leave. Or possibly the ES 100 degree in this FL would be a good replacement?

    My thinking is that I'm getting backlight reflections from the ocular (eye lens) end of the eyepiece.

    Abb, thanks for looking into it for us (me).
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