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Thread: DOCTER completing my ultrawide arsenal

  1. #31
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    Default Re: DOCTER completing my ultrawide arsenal



    It is obvious that the Doctor performs better on details and contrast. Clearly visible. It belongs to the best in the topclass.
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  3. #32
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    Default Re: DOCTER completing my ultrawide arsenal

    Hello not_Fritz,

    some distortion on the DOCTER has been reported, but during my short test - it has been pretty cold outside -
    I can't say how much distortion it shows, and when, then definitely less distortion than the Leica and Zeiss spotting eyepieces.

    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. #33
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    Default Re: DOCTER completing my ultrawide arsenal

    Quote Originally Posted by j.gardavsky View Post
    Hello not_Fritz,

    some distortion on the DOCTER has been reported, but during my short test - it has been pretty cold outside -
    I can't say how much distortion it shows, and when, then definitely less distortion than the Leica and Zeiss spotting eyepieces.

    Best,

    JG
    Understood. My ultra sensitivity to distortion notwithstanding it's so close to zero that I'd find it a very interesting eyepiece.

    I am troubled by the fuzzy field stop on your Tak ortho though. I don't recall ever seeing anything like that in my KK of the same focal length.
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  5. #34
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    Default Re: DOCTER completing my ultrawide arsenal

    Hello not_Fritz,

    the larger camera lens gets vignetted due to the small eye lens of the Tak, and this causes the drop of brightness.
    Hence, the camera does not see the field stop of Tak.

    Best,

    JG
    Last edited by j.gardavsky; 11-20-2018 at 07:19 PM.
    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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  6. #35
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    Default Re: DOCTER completing my ultrawide arsenal

    Hello all,

    I have forgotten to say that, it is the Tak Abbe 12.5mm - the rebranded KK Fujiyama Abbe ortho.
    Best,

    JG
    Last edited by j.gardavsky; 11-20-2018 at 08:00 PM. Reason: corrected info
    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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  7. #36
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    Default Re: DOCTER completing my ultrawide arsenal

    Very nice presentation JG.
    Thank you for taking the time to share this with us...much appreciated Sir!
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  9. #37
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    Default Re: DOCTER completing my ultrawide arsenal

    Quote Originally Posted by j.gardavsky View Post
    the larger camera lens gets vignetted due to the small eye lens of the Tak, and this causes the drop of brightness.
    Hence, the camera does not see the field stop of Tak.
    Quote Originally Posted by j.gardavsky View Post
    I have forgotten to say that, it is the Tak Abbe 12.5mm - the rebranded KK Fujiyama Abbe ortho.
    Thanks much for these useful clarifications.
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  11. #38
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    Default Re: DOCTER completing my ultrawide arsenal

    Thanks for this JG: it looks like you have a "keeper" in that Docter eyepiece! I am surprised that it appears sharper than the KK/Tak ortho, and it even seems to be brighter in the colours- the cream colour of the walls is much "richer".

    There does appear to be a slight upward curve of the house roof to the RH corner of the image, which may indicate a minor amount of pin-cushion distortion (although I can't see any corresponding curve to the left): but if the roof is anything like the roof of our house, it could be just its construction, or a bit of settling of the roof-line with age due to weight of the tiles!
    I guess a detailed star test, or an image of a rectangular grid, would be better to show any possible distortion- but it looks like it would be negligible.

    I wonder if your neighbours know that their house is regularly scrutinised by people all around the world?

    It is interesting that the price of the 12.5mm KK Ortho from our Aussie supplier is $A150 vs $215 for the Tak re-branded version from the same dealer. That is nearly 50% mark-up just to put a brand-name on it!!! Hmm...

    All the best,

    Dean
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  13. #39
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    Default Re: DOCTER completing my ultrawide arsenal

    Hello Dean,

    and thank you for your questions.

    Re: Distortion of DOCTER
    I will certainly test it on the nearby roofs, even if they are not perfect rectilinear.
    There have been some distortion reported, but making a pan, I did not feel sea sick.

    Re: Tak (KK Fujiyama) pricing
    Tak mounts the lens cell of KK Fujiyama into their tubes, and they put a rubber eyeguard on it.
    So, there is an added value by Tak, take it or leave it.

    Re: The house in the village down in the valley
    I have finally selected this house as a test object, as I get minimum air turbulence along the line of sight towards this house.
    Since some time, they seem to keep their backyard in a better condition, and clean the windows more frequently, ha, ha.

    Re: Contrast of DOCTER
    The contrast of the views is really very high, and similarly to the old DOCTER Porro prism binoculars, the red color is better saturated than through the Tak (KK Fujiyama). This may be due to the better multicoatings, or due to a better match between the low dispersion and high refractive index lens materials, or due to these both.

    Re: DOCTER parfocal with other eyepieces
    I have forgotten to mention the parfocality in the report. So, the in-focus difference to the Tele Vue Plössl 25mm and to the Pentax XW 10mm is within 2mm into the OTA.

    Tests with the Baader VIP Barlow will be made later, as soon as the weather permits.

    Whatever the other tests will reveal, I will also keep the Tak (KK Fujiyama), as the short focus Abbe orthos transmit more light in the blue/violet than all of the ultrawide designs.

    Best,

    JG
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    Default Re: DOCTER completing my ultrawide arsenal

    Enjoy your new eye piece John.

    Clear skies.
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