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Thread: Aperture Vs. Exit Pupil

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    Default Aperture Vs. Exit Pupil



    My Celestron Cometron 7x50 ($30) puts up a clearer/better image than my Oberwerk LW 15x70 ($129). Maybe I should Have gotten the LW 11x70 version. At what point does exit pupil trump aperture? My thinking is it varies from person to person.

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    Default Re: Aperture Vs. Exit Pupil

    Day time or night time? Also, better in what way (brighter, more contrast, sharper)? It could be that your 15x70 need collimation.

    Optimal exit pupil depends on how wide your eyes can dilate and also how dark are your skies.

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    Default Re: Aperture Vs. Exit Pupil

    Quote Originally Posted by refractordude View Post
    My Celestron Cometron 7x50 ($30) puts up a clearer/better image than my Oberwerk LW 15x70 ($129). Maybe I should Have gotten the LW 11x70 version. At what point does exit pupil trump aperture? My thinking is it varies from person to person.
    Hello Refractordude.

    As you say, it varies from one person to another one.
    I like the excellent Docter 7x50, but I really love the Nikon 10x70 Astroluxe (Japan) and the 10.5x70 BA8 (China).
    Best,

    JG


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    Default Re: Aperture Vs. Exit Pupil

    Bigzmey:

    The contrast is good in both, but Celestron's Cometron have what I will call a clearer view. However, the Oberwerks can go deeper for finding DSO.
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    Default Re: Aperture Vs. Exit Pupil

    Quote Originally Posted by refractordude View Post
    Bigzmey:

    The contrast is good in both, but Celestron's Cometron have what I will call a clearer view. However, the Oberwerks can go deeper for finding DSO.
    This is puzzling. The exit pupil on the Celestron is a little over 7. The Oberwerk is less than 5 by a tad. There is no way that the Celestron set should give a clearer, more contrasty view. I suspect the Oberwerk set needs collimation or adjustment.
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    Default Re: Aperture Vs. Exit Pupil

    Quote Originally Posted by refractordude View Post
    Bigzmey:

    The contrast is good in both, but Celestron's Cometron have what I will call a clearer view. However, the Oberwerks can go deeper for finding DSO.
    Hello Refractordude,

    it may be the case that your 15x70 have caught somewhere on the optics internal fogging.
    Tracing the optics with the green laser beam, or with a UV lamp, may show it.
    The 15x70 have been reported to have some vignetting - not the full aperture is used because of the undersized prism house. The interior of these binos is also not particularly protected against the stray light. All these result into the loss of contrast when viewing.

    I used to have the Teleskop Service version of these Celestron 15x70, but gave them away because of the CA and spherochromatic aberration, more due to the simple eyepieces inside.

    The 15x70 Celestrons are great for their price - bang for the buck they say,
    but even then, you get what you have payed for.

    When you want better 15x70 binos, then lay out $400 for the Oberwerk Ultras
    https://oberwerk.com/product/oberwer...ies-10-5x70mm/
    And when you want the even better 15x85 as I am using, then toss 600EUR for those from TS
    https://www.teleskop-express.de/shop...miarmiert.html

    Best,

    JG
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    Default Re: Aperture Vs. Exit Pupil

    When I look through the front of the two binoculars, I notice the 7x50 are much more clear. Perhaps lighter/cheaper coatings. I am happy with the Oberwerk. Maybe I am making it seem worst than it is. To go deeper for DSO, I just purchased a Celestron 20x80 Skymaster. It is collimated, with very sharp Moon craters. When I get around to it, I will post a comparison of the Oberwerk 15x70 vs Celestron Skymaster 20x80.
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    Default Re: Aperture Vs. Exit Pupil

    Quote Originally Posted by refractordude View Post
    When I look through the front of the two binoculars, I notice the 7x50 are much more clear. Perhaps lighter/cheaper coatings.
    No. If they look clearer then the coatings are in better shape. If the front of the Oberwerk looks less clear then there is something wrong with the coatings IMO.

    I am happy with the Oberwerk. Maybe I am making it seem worst than it is. To go deeper for DSO, I just purchased a Celestron 20x80 Skymaster. It is collimated, with very sharp Moon craters. When I get around to it, I will post a comparison of the Oberwerk 15x70 vs Celestron Skymaster 20x80.
    Interesting. It sounds to me like your Oberwerk has some coating or other optical defect.
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