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Thread: Orion Giant 25x100 Vs. Barska Cosmos 25x100 Vs. Zhumell Giant 20x80 Binoculars

  1. #1
    refractordude's Avatar
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    Default Orion Giant 25x100 Vs. Barska Cosmos 25x100 Vs. Zhumell Giant 20x80 Binoculars



    I was very excited when my Orion Giant 25x100 binoculars arrived. However, when the dust from my excitement settled, I realized several issues. The Orion Binocular focusers had a grinding sound when adjusting for sharpness. The inside edges of the eyepieces were not blackened. Thus, light would reflect into the lower third of my view. This light reflection made the Orion Giant 25x100 useless for daytime use, and lowered contrast/brightness of objects for night time use. The Orion binoculars are not waterproof, and has no threads for filters. Thus, I feel the Orion binoculars are way over priced at $350. The Orion binoculars were returned to Amazon for a complete refund. Amazon paid for return shipping.

    The Barska Cosmos 25x100 binoculars cost $300 at Walmart's website. They are waterproof, nitrogen purged, and put up a better view than the Orion 25x100 binoculars. However, the eye relief was to short at 15.4mm. I had to return the Cosmos. So I considered the Zhumell 25x100 that cost $300. They have threads for filters, and are waterproof/nitrogen purged. However, the 25x100 Zhumels have an eye relief of 15.4mm as well.

    I once owned the Celestron Skymaster 20x80. I returned them to Amazon for a pair of 25x100, and other reasons. I did noticed that the 20x80 Skymasters put up a brighter view of LDN 1627/M78 than my 120mm f/8 refractor. So I decided to give the $127 Zhumell Giant 20x80 binoculars a try. Tried them out last night at Maryland's Point Lookout State Park. They have an eye relief of 17mm, and put up a view just as good as any of the 25x100 binoculars that I purchased and returned.

    I could be wrong, but most of the 25x100 binoculars on the market have a true aperture of 88mm. I marked a piece of paper three inches from the edge. I shinned a flash light into the left lens of my Zhumell 20x80 binoculars. I put the marked paper at the front of the binoculars. The light coming out onto the paper appears to be little over three inches. I am not a technically proficient person. I just don't have a knack for carpentry etc. Perhaps someone else should do an aperture test on the Zhumell 20x80 binoculars. However, the 20x80 Zhumells seem to have a true aperture of three inches. Thus, not noticeably dimmer than the average 25x100 binoculars on the market that cost twice as much.

    To get 100mm aperture binoculars, one would have to buy the HK premium quality lenses, which is out of my price range at this time. I think the Oberwerk Deluxe have HK aperture and lenses.

    Check this out https://www.flickr.com/photos/146413...posted-public/

    https://www.flickr.com/photos/146413...posted-public/

    https://www.flickr.com/photos/146413...posted-public/

    Gonna keep my lovely Zhumell Giant 20x80 binoculars. The Zhumells are brighter/sharper than my Oberwerk 15x70/really 15x64. They also have a larger field of view, just as bright/sharp as any of the the 25x100 binoculars I have tried. The Zhumell 20x80 on my Farpoint Universal binocular mount, is a match made in heaven. I may just upgrade to 20x80 ed/apo binoculars with individual focus, and interchangeable eyepiece. The HK 25x100 binoculars may be purchased instead, but not if I purchase a 152mm f/5 refractor.

    By the way, who else sells the HK 25x100 binoculars in the USA besides Oberwerk. I love options.
    j.gardavsky, DeanD and Ozman13 like this.

  2. #2
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    Default Re: Orion Giant 25x100 Vs. Barska Cosmos 25x100 Vs. Zhumell Giant 20x80 Binoculars

    Hello refractordude,

    that's all true what you are writing, I have made similar recommendations about the HK in past as well, ha, ha.
    The Dobs loose light on the scattering from the mirror surface, Henk Camelhat is correct, the only thing you buy with bigger Dobs is more useable magnification.
    The next issue is with the eyepieces, one shows the nebula, another not.
    Ask me why the Docter EP is sharp edge to edge across 85deg AFOV, and the other ultrawides fail at sixty, or even nifty fifty.
    One could write a book about it, but I have no lust, ha, ha.

    Glad you have got it squared, my friend,

    JG
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    Default Re: Orion Giant 25x100 Vs. Barska Cosmos 25x100 Vs. Zhumell Giant 20x80 Binoculars

    Does anyone know who else makes the HK binoculars?

  4. #4
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    Default Re: Orion Giant 25x100 Vs. Barska Cosmos 25x100 Vs. Zhumell Giant 20x80 Binoculars

    Hello refractordude,

    both the HK and the later versions of FB are made in the Kunmimg Optical area in China, a sort of their Rochester,
    what Rochester used to be in optics in past.
    What you buy are the brand names, having nothing to do with making the binoculars, QC, etc.
    Since Garrett Optical has ceased to exist, the specifications of the binoculars from Kunming became a sort of uncertain.
    Garrett used to test the binoculars, to list the specifications as found, and to make a 16 points check for o.k. before delivery to the customer

    You can visually identify 'who is who' in the 25x100 class, according to the prism, house and the multicoatings on the eyepieces, so far the vendor offers pictures of the binoculars.
    So, the prisms and the EPs make the technical difference between FB and HK, which turns into the different performaces.

    You can also ask the vendor if it is FB or HK, but you may guess what answers you will get.

    Best,

    JG
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    Binoculars: Leica Ultravid 7x42, 8x42HD; Swarovski EL 8.5x42 Swarovision; Nikon 10x70 Astroluxe; Docter Nobilem 7x50 Porro; Jenoptem 7x50W, 10x50W; BA8: 10.5x70, 15x85; 25x100FB, AsahiPentax 8x40, Refractors: Sky-Watcher 150mm/750mm; Leica APO Televid 82mm (25x-50x WW ASPH); EPs:Baader Classic Orthos; Fujiyama ortho, Leica B WW, ultrawide zoom ASPH, Periplan GF, HC Plan S, L; DOCTER UWA; Wild UW mil; Tele Vue Delos, Nagler Zoom, Plössls; Swarovski SW; Pentax XW; ZEISS diascope B WW T*, Carl Zeiss E-Pl; Hensoldt mil; Filters: Astrodon, Astronomik, Baader (CCD), TS;
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    Default Re: Orion Giant 25x100 Vs. Barska Cosmos 25x100 Vs. Zhumell Giant 20x80 Binoculars

    Loving this thread, I think this is a very interesting discussion

 

 

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