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Thread: 28mm ES 68░, 2" Argon Purged

  1. #1
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    Default 28mm ES 68░, 2" Argon Purged



    I can't wait for Father Christmas and I am seriously jonesing for one of these:

    https://www.bresseruk.com/astronomy/...iece-28mm.html

    At just under half a kilo it should be fine on my ED80 or other refractors. Does anyone use one on a fast scope? I have the 14mm, 82░, 1.25" ES eyepiece. I think it's pretty good but I'm convinced it suffers from a little field curvature, although I've been told that this mainly applies to the 14mm version. I'd just like to hear what any users of the 28mm, 68░ version think.

    Argon's what they filled the Hindenburg with right?

    Or am I thinking of Kryptonite?
    j.gardavsky likes this.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

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    Default Re: 28mm ES 68░, 2" Argon Purged

    Quote Originally Posted by Shorty Barlow View Post
    I can't wait for Father Christmas and I am seriously jonesing for one of these:

    https://www.bresseruk.com/astronomy/...iece-28mm.html

    At just under half a kilo it should be fine on my ED80 or other refractors. Does anyone use one on a fast scope? I have the 14mm, 82░, 1.25" ES eyepiece. I think it's pretty good but I'm convinced it suffers from a little field curvature, although I've been told that this mainly applies to the 14mm version. I'd just like to hear what any users of the 28mm, 68░ version think.

    Argon's what they filled the Hindenburg with right?

    Or am I thinking of Kryptonite?
    Nah, it was hydrogen. Yes, longer FL 82deg EPs highlight or exaggerate field curvature already present in fast refractors. Some more than others. This effect typically is less pronounced in 68-72 deg EPs. Never tried ES68 28mm, but I really like 16mm, 20mm a 24mm in that series.

    I tried a couple of glass grenades, but can't stand the weight and size. I much prefer Baader Aspheric 31mm in that range.
    Shorty Barlow likes this.

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  4. #3
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    Default Re: 28mm ES 68░, 2" Argon Purged

    Hello Shorty Barlow,,

    this sounds great for the richiest field views!

    Hindenburg balloon has been filled with hydrogen, it explodes better.
    On board, they have been drinking the Mosel Sonnenlay, one of my favourite Rieslings.
    Been there on Sonnenlay, and been drinking there.

    Can't wait on your review,

    JG
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    Default Re: 28mm ES 68░, 2" Argon Purged

    Quote Originally Posted by Bigzmey View Post
    Nah, it was hydrogen. Yes, longer FL 82deg EPs highlight or exaggerate field curvature already present in fast refractors. Some more than others. This effect typically is less pronounced in 68-72 deg EPs. Never tried ES68 28mm, but I really like 16mm, 20mm a 24mm in that series.

    I tried a couple of glass grenades, but can't stand the weight and size. I much prefer Baader Aspheric 31mm in that range.
    I haven't noticed any real field curvature with my 16mm T5 Nagler, but with the 14mm ES it was virtually the first thing that I noticed. I have the Baader 31mm and 36mm Aspherics. I haven't got many 2" EP's mainly because the 'glass grenades' are too heavy.

    My ED80 is very robust however, it has almost the same OTA circumference as my ST102, I think there's only half a centimetre in it. Possibly as a consequence of this, and the fact that it is about 60 centimetres long and 'nose heavy', it seems very balanced when a combined 2" diagonal and a 2" EP weighing around a kilogram is in the focuser.

    I discovered this whilst daylight testing a new APM diagonal with a variety of 2" eyepieces and culminating with my 19mm Celestron Luminos. I expected the Luminos to be ungainly, as it is on my ED72 on the AZ5 mount, instead to my surprise it was very easy to use and manipulate.

    The APM diagonal and Luminos combined are 1077 grammes. I'll have to try some more weight trials but I'm beginning to think using eyepieces around 400 ~ 450 grammes (or even half a kilo) is very possible on my Evostar ED80.
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    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

  6. #5
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    Default Re: 28mm ES 68░, 2" Argon Purged

    Quote Originally Posted by j.gardavsky View Post
    Hello Shorty Barlow,,

    this sounds great for the richiest field views!

    Hindenburg balloon has been filled with hydrogen, it explodes better.
    On board, they have been drinking the Mosel Sonnenlay, one of my favourite Rieslings.
    Been there on Sonnenlay, and been drinking there.

    Can't wait on your review,

    JG
    I may have to resort to drinking wine while I wait for decent enough weather to review anything lol.
    j.gardavsky likes this.
    TS Optics: 150mm, f/6 Newtonian (GSO SVD series). Altair: Starwave 102ED-R. Sky-Watcher: SkyMax 102mm, SkyMax 127mm, Evostar 72ED DS Pro, Evostar 80ED DS Pro, ST80 (TS Focuser), ST102 (TS Focuser), EQ5 Deluxe, AZ5 Deluxe. Vixen: Porta II, SXG Hal-130. Orion: 90mm StarMax , ST80 (TS Focuser). Celestron: NexStar Evolution 9.25". William Optics: E-BINO-P Binoviewer. A shed load of eyepieces including: Antares, Astro Hutech, Baader, Bresser, BST, Bushnell, Celestron, Explore Scientific, GSO, Kokusai, Meade, Orion, Sky-Watcher, Solomark, SvBony, TeleVue, Vixen & one or two I'm not sure of.

 

 

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