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Thread: Celestron SkyMaster 15x70 or not?

  1. #31
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    Default Re: Celestron SkyMaster 15x70 or not?



    Quote Originally Posted by LunaSwift View Post
    I hope you wont mind me popping up on this thread , but I have the choice of the Celestron 15 x 70, 20 x 70, or 20 x 80,
    which would be the best . I do have a heavy Tripod, a monopod and a good lounger chair, so support is no problem, Just wanted to know what would be the best choice optically
    Thanks
    Graham
    Hello Graham,

    I'd go for the 20x80, as you already have a good tripod and observing chair.
    Regarding the makes, these Helios Stellar CF (central focusing) look like the classical Japaneese design,
    Helios Stellar (CF) 20x80 Observation Binocular at Viewpoint Optics
    but most of the Japaneese classics suffer from a short eye relief. With the CF, you can also easily focus these binoculars on sports, wildlife, birding, events. The astronomy binoculars have mostly the individual focus (IF).

    If I were in U.K., I'd keep to one of the Helios brand 20x80 binoculars. They are manufactured in China, but under the Helios quality inspection standards, 20x80 Binoculars | Shop for 20x80 Binoculars at www.twenga.co.uk

    As always, check out if the binoculars are specified with the BaK4 prisms and fully multicoated (multicoated on all glass-to-air surfaces). Long eye relief (more than 16mm) is very comfortable, and the fog free binoculars are likely to be sealed, purged, and provided with added protecting coatings - at least one of these technologies should apply.

    I'd avoid the binoculars with very oversized prisms: they offer more field of view, but they add some annoying colour blur around the bright stars, and degraded views towards the edge of the field of view.

    Wishing you the best choice,

    JG
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  2. #32
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    Default Re: Celestron SkyMaster 15x70 or not?

    Quote Originally Posted by LunaSwift View Post
    Re above, I have just found out that the 20x70s I referred to are actually 25x70 so maybe I will go for the 15x70s Less chance of shake
    Graham
    If you have a heavy tripod I think the skymaster's will satisfy your needs pretty well. I been having fun just hand holding mine, and I'll really be able to speak for them when I try them with darker skies. I will likely try them again tonight, to be honest, I think they are great value.
    -Nick
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    Default Re: Celestron SkyMaster 15x70 or not?

    Quote Originally Posted by Kizoku View Post
    Small collimation adjustments can be made quite easily. Read these two articles carefully :
    “Collimating” Binoculars - How To
    O B E R W E R K - High Performance Optics for Earth & Sky
    The second article is easier to follow but the first one also explains what to do when the exit pupil's shape is wrong.

    I found a significant vertical misalignment in my binos following these articles and managed to correct it in 2 minutes.

    Should you go for it, be careful when you turn the adjusting screws for the first time because they are glued and will need a little more force. Just don't put too much pressure.
    Thanks to you and others that responded to my post; I'll give it a go and review those links.

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