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Thread: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

  1. #21
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm



    I’m also going with the Zeiss as consistently sharper across the image, but agree with Don’s observations regarding brightness.

    This is quite enjoyable.
    Mary

    Scopes: Vixen VMC200L, D=200mm, F=1950, f/9.75; Televue 2" Everbright diagonal. Coronado PST; AstroTech EDT 80mm, F=480, f/6. Mounts: Vixen SXW/Starbook (original); Stellarvue M2C alt-az. Eyepieces: Televue: 55mm Plossl, 22mm Panoptic, 17.3mm Delos, 13mm Nagler, c. 1980, 11mm Plossl, 7mm Nagler; Meade 15mm Super Plossl; VERNONSCOPE 2.4X BARLOW. Binoculars: Leica 8x32 Trinovids, circa 1997; Orion Megaview 20x80, Orion Paragon Plus mount.

  2. #22
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    Hello Don, hello not_Fritz,

    I agree, and here some add-ons.

    Transmissivity

    When holding the both eyepieces against the daylight skies, my estimate is, that the Delos yields 3% - 4% more light than the Zeiss, and maybe even slightly more on the yellow colors, when tested on the reflected light on our terrace.

    Zeiss claims 90% reflectivity as a minimum, and this is consistent with the Zeiss T* coatings and with the loss on the antifog protective coatings. The new HT coatings, also used now by Baader, would be better.
    The Tele Vue eyepieces are well known for their very high transmissivity, but they have no antifog protection.
    With the 8 lenses in the Delos against the 7 lenses in the Zeiss, the Delos with the Tele Vue multicoatings may still achieve the peak value around 95%, just my guess when recalling the higher transmissivity of the Tele Vue Plssls against the other Plssls.
    Finally, the camera light metering and the shutter control, and the time between the captures, makes the final difference as seen on the captures.

    The long text short, the Delos is expected to transmitt more light.

    The still opened question is, how much this will be visible on the nebulae and galaxies in the blue-blue/green spectral range 400nm - 500nm.

    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, Plssls; 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. #23
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    Are you really going to make us wait until August/September to find out JG?
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    Default Re: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    Hello Don,

    the test objects will be in the Cygnus X area, and the best time is August/September.
    One of these objects will be the Propeller Nebula DWB111, as recently captured by Scott Champion
    DWB 111, Propeller Nebula in Ha

    The DWB nebulae are more difficult than the Lynd's Bright Nebulae, and these are more difficult than the Sharpless Sh2 nebulae, and these are again more difficult than the NGC/IC stuff.
    And we have all of these levels of difficulty in Cygnus and closely around.

    Otherwise, I don't expect significant difference in performance between the TV 17.3 Delos, and the Leica B WW
    and Zeiss B WW eyepieces (and eventually Leitz Periplan GF), but let's see.
    In 2017, I have got a feeling for the differences between the EPs when looking for the segments of the outer shell of the Dumbbell Nebula, https://www.google.com/search?q=Dumb...oXlKKyS7nVMSM:

    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, Plssls; 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: Tele Vue 17.3mm Delos against Zeiss 23x 30x B WW 17.1mm

    Tulip Nebula Sh2-101: Delos 17mm against Zeiss 23x/30x B WW and Leica B32x WW

    Hello all,

    the Tulip Nebula Sh2-101 in Cygnus is one of my favourite tough targets to test the performance of the eyepieces on my 6 F/5 achromatic refractor.
    The nebula surrounds a wide pair of stars between the open cluster NGC 6871 and the bright Eta Cygni star. This pair of stars is in fact a narrow pair in a wide pair, and with some stars color contrast.

    This amazing capture by Scott Champion
    Sh2-101 Tulip Nebula 'HST Palette'
    reveals a ionized Hydrogen glow around the pair of stars, and a concentrated fainter ionized Oxygen glow out of the narrow pair in the wide pair of stars.

    Hence, I have been quite curious, how the both glows will bee separated through the eyepieces.

    Observing session on the 5th August, 2018

    Tele Vue Delos and the Zeiss have revealed very similar views in the H-Beta and OIII light with a little plus for the Zeiss, showing more extension of the H-Beta light NW of the pair of stars. The smaller OIII glow streaming out of the narrow stars pair, has been very faint through the both eyepieces, but still visible with the direct vision.

    The Leica eyepiece has revealed more extent of the H-Beta light towards NW, than the Tele Vue Delos and Zeiss. The very faint OIII light has been about the same through the 3 eyepieces.

    Observing session on the 6th August, 2018

    The tests of the Tele Vue Delos, Zeiss and Leica, have been repeated with the same results, just to confirm the reproducibility of the differences.

    Finally, and due to my curiosity, I have mounted the Pentax XW 10mm (magnification 75x, exit pupil 2mm) to try to eventually see some details in the ionized Hydrogen glow through the H-Beta filter.
    After a while, I have been able to see some uneven placed patches of darkness at the lowest levels of faintness, but still reproducible when moving the scope or rolling my eye.
    This, what I am calling the patches of darkness, is due to the structured Fish On The Platter dark nebula in the Eta Cygni region. The Fish On The Platter makes an overlay on the Sh2-101 in the bacxkground, resulting into the structured tulip-like appearance.
    A similar case is the LDN935, intruding between the North America and Pelican nebulae, and causing the structure in the Golf of Mexico.


    Date and time: 5th August, 2018, 23:00 24:00; 6th August, 2018, 22:30 23:30
    Place: Backyard
    Observing conditions: NELM close to 5mag in zenith, 5.5mag on the second observing session
    Telescope: 6 F/5 Synta (Sky-Watcher) achromatic refractor
    Eyepieces: Antares W70 25mm star hopper, Tele Vue 17.3mm Delos, Zeiss 23x/30x B WW 17.1mm, Leica B 32x WW 14mm, Pentax XW 10mm
    Filters: Astronomik UHC, Astronomik H-Beta, Baader visual 10nm OIII, Astrodon CCD 5nm OIII
    Side-by binoculars: 10.5x70 BA8, 25x100 FB

    Thank you for reading,

    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, Plssls; 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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