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Thread: Which Of These 15mm Eyepieces Would Buy

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    Default Which Of These 15mm Eyepieces Would Buy



    Which of these 15mm eyepieces would you buy, and why?

    15mm Agena Enhanced Wide Angle 1.25" 15mm $45

    GSO Superview 1.25" 15mm $45

    Agena Super Wide Angle (SWA) 1.25" 15mm $45

    I have 120mm f/8, 90mm f/7.2, and 70mm f/12.9 refractors.
    j.gardavsky and lign like this.

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    Default Re: Which Of These 15mm Eyepieces Would Buy

    They are all 15mm 66-70° AFOV eyepieces so the view will be the same in them all.
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    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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    Default Re: Which Of These 15mm Eyepieces Would Buy

    I am also considering these exact same EP's and would love to hear any feedback from anyone.
    Newbie returning after 15 years
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    Default Re: Which Of These 15mm Eyepieces Would Buy

    As I already said, they are essentially the same eyepiece.
    2 have 4 elements and one has 5 elements, all are probably based on the Konig or Erfle eyepiece design.
    They would work fine in a long focus refractor or Cassegrain but will probably not work the best in a fast reflector.
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    Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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    Default Re: Which Of These 15mm Eyepieces Would Buy

    Quote Originally Posted by Gabby76 View Post
    As I already said, they are essentially the same eyepiece.
    2 have 4 elements and one has 5 elements, all are probably based on the Konig or Erfle eyepiece design.
    They would work fine in a long focus refractor or Cassegrain but will probably not work the best in a fast reflector.
    What problems are we likely to encounter when using these in a fast reflector? What do you recommend instead?
    Newbie returning after 15 years
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    Orion Sky View Pro EQ 127mm Maksutov-Cassegrain 1540mm F/12.1
    Eyepieces: Orion Vintage Sirius Plossl's: 25mm & 10mm, Orion Shorty Barlow, Meade moon filter

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    Default Re: Which Of These 15mm Eyepieces Would Buy

    I have the 15mm GSO SuperView and a 9mm Orion Expanse.

    IMG_20170520_154404.jpg

    IMG_20170304_172143.jpg

    I'm fairly convinced the SuperView is a 'Bertele' design. The Expanse is similar to the Agena Enhanced Wide Angle and I believe they are both manufactured by Barsta. I don't know about the Agena Super Wide Angle. I've used the SuperView and the Expanse in an f/5 refractor although I probably wouldn't use the SuperView in a fast reflector. I can't comment on the Agena Super Wide Angle but it seems smaller than the others and probably has a smaller field stop. So regardless of its AFOV it won't seem as 'immersive' as an eyepiece with a larger field stop IMO. The Expanse is quite a nice eyepiece to actually use although eye placement can be uncomfortable and it can suffer from blackouts until you get used to it. The 15mm SuperView is a much more user friendly eyepiece and is a bit like a budget 19mm Panoptic in some respects.

    IMG_20170520_141649.jpg

    I was quite surprised that it didn't vignette much with a 0.5x reducer which effectively turned it into a 30mm EP.

    IMG_20171202_130520.jpg

    So I find it is quite adaptable. If I was going to recommend one of these it would probably be the SuperView, especially for scopes f/6 and slower. It is adaptable, ergonomically pleasant to use, has an eye relief of around 13mm I believe and is competitively priced.
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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.

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    Default Re: Which Of These 15mm Eyepieces Would Buy

    i have the 20mm SuperView and it produces some coma... maybe 10-15% of the radius is visibly distorted, getting bad at the edges. that's in my 8" f4.9 newt.

    i wanted to explore the series more, in fact i had the 15mm in my agena cart at one point, but i'm afraid the design just isn't friendly with the scope.

    i don't have a corrector, that might make a difference.
    primary scope --> Orion 8" f/4.9 newt, Moonlite CR2 8:1
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    Default Re: Which Of These 15mm Eyepieces Would Buy

    Is money a limiting factor

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    Default Re: Which Of These 15mm Eyepieces Would Buy

    Quote Originally Posted by Shorty Barlow View Post
    I have the 15mm GSO SuperView and a 9mm Orion Expanse. I'm fairly convinced the SuperView is a 'Bertele' design.
    The 15mm Superview is actually the black sheep of the line. The 20mm and up are all 5 element Erfles, but the 15mm is a 4 element design so you could be right. I can only speak to the performance of the 30mm in this series, in a F5 reflector it performs pretty admirably.

    I do have the full Expanse line (same as Agena EWA's) In a F5 dob they were just passable, better than most starter EP's but still alot of distortion around the outer 30% of the FoV. I was never impressed with these until I finally got a F10 refractor, where the image quality was very good, sharp almost to the edge and nice contrast. They have generous eye relief but one or two still have an odd habit of blacking out if your eye isn't positioned just right. It's a minor annoyance. The Expanse are actually on sale over at Telescope.com right now which makes them cheaper than their Agena counterparts, so at the discounted price for the OP's long refractors I'd have no problem recommending them as a good purchase based on value per dollar.

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    Default Re: Which Of These 15mm Eyepieces Would Buy

    Quote Originally Posted by Don Alvarez View Post
    The 15mm Superview is actually the black sheep of the line. The 20mm and up are all 5 element Erfles, but the 15mm is a 4 element design so you could be right. I can only speak to the performance of the 30mm in this series, in a F5 reflector it performs pretty admirably.

    I do have the full Expanse line (same as Agena EWA's) In a F5 dob they were just passable, better than most starter EP's but still alot of distortion around the outer 30% of the FoV. I was never impressed with these until I finally got a F10 refractor, where the image quality was very good, sharp almost to the edge and nice contrast. They have generous eye relief but one or two still have an odd habit of blacking out if your eye isn't positioned just right. It's a minor annoyance. The Expanse are actually on sale over at Telescope.com right now which makes them cheaper than their Agena counterparts, so at the discounted price for the OP's long refractors I'd have no problem recommending them as a good purchase based on value per dollar.
    I think the 15mm SuperView works well in reflectors up to f/6 and refractors of f/5. I have a borked 15mm SuperView which I replaced with a new one. So I decided to dissect it in the name of astronomical science lol.

    IMG_20180206_162319.jpg
    IMG_20180206_162559.jpg
    IMG_20180206_162840.jpg

    In the pictures above the eye lens is on the left and the field lens is on the right. There are three groups divided by spacers with the field lens being a doublet as far as I can tell. Unlike the Bertele the eye lens has a convex surface.

    Screenshot 2018-02-06 at 16.42.31.png

    I suppose it could be a form of reversed Bertele.
    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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