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Thread: Binoculars: BaK4, BK7, fully multicoated - FAQ

  1. #11
    Tetenterre's Avatar
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    Default Re: Binoculars: BaK4, BK7, fully multicoated - FAQ



    Quote Originally Posted by j.gardavsky View Post
    Thanks for your input, and looking forward to your binocular tests
    Well, well, that was very instructive, not only about binoculars but about human (well, this one, anyway) perception!

    I compared 3 binoculars:
    Opticron 10x42 BGA
    United Optics BA8 15x70
    United Optics BA1 15x70

    I used two comparison backgrounds:
    Low contrast: green vegetation against a wooden fence
    High contrast: TV antenna against a clear sky (first blue we've seen for weeks here!)

    I suspected a difference in clarity between the BA8 and the BA1 (as I've remarked elsewhere, the BA1 is really a 15x62; the difference in exit pupil size is astounding).
    I could not detect any difference in clarity between the Opticron and the BA8.
    The difference in clarity between the Opticron and the BA1 was immediately obvious.

    Thanks, JG, for providing the impulse for me to do that: I've definitely learned something new today.
    Last edited by Tetenterre; 03-29-2013 at 08:47 AM. Reason: Clarity
    j.gardavsky and JFD like this.
    C&DS, Steve

    Binoculars: Opticron 10x42 BGA, United Optics BA8 15x70, Miyauchi Bj100B 20/37x100
    Telescopes: 90mm Gregory-Maksutov, 305mm f/4.9 Dob.

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    j.gardavsky (03-29-2013)

  3. #12
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    Default Re: Binoculars: BaK4, BK7, fully multicoated - FAQ

    Hello Steve,

    thanks for the shootout, the Opticron is a nice surprise. Any traceability of Opticron to their technologies and manufacturing?

    Best,

    JG
    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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  4. #13
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    Default Re: Binoculars: BaK4, BK7, fully multicoated - FAQ

    Hello Steve,

    I have finally found some tests on one of the Opticron binoculars Opticron Countryman 8x42 BGA T - binoculars review - allbinos.com , even if I am not sure how trustworthy independent the allbinos web site is, as it related with a company involved in optics making.

    Best,

    JG
    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: Binoculars: BaK4, BK7, fully multicoated - FAQ

    Hi JG,
    I was just wondering, because the DSO objects appear dimmer than the Bright objects clearly visible by the naked eye, when does the light transmittance of the prism start to impact our ability to see.
    In other words are there objects not visible with the BK7 that would be easy to spot with BaK4?
    Are there examples of BK7's that for the case of cost would be pretty good or adequate to see DSO's.

    Thank You
    In advance.
    Rich
    Rich (Filterxpert)

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