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Thread: Leica Zoom WW 25x – 50x ASPH and barlowed against the Pentax SMC XW 3.5mm

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    Default Leica Zoom WW 25x – 50x ASPH and barlowed against the Pentax SMC XW 3.5mm



    Hello all,

    since the Holiday Season, I have an adapter to use the Leica Zoom from the 82mm Leica APO Televid on the 6” F/5 Synta (Sky-Watcher) achromatic refractor.
    As today we have had the first sunny day with just a minimum of clouds, I have decided to mount the Leica Zoom on the triplet Barlow from the Baader Q-Turret set, and to start a shootout against the Pentax XW 3.5mm on the terrestrial targets.

    Well, the inspiration comes from some Leica freaks in the U.S. and Germany
    https://www.cloudynights.com/topic/2...asph-178-89mm/
    Leica Televid Okulare im Astroeinsatz | Okulare, Filter, Sucher... | Astronomie.de

    who are mounting the Leica Zoom eventually together with the Baader CaF2 Barlow/flattener on the large aperture telescopes.

    One more reason to consider using the Leica Zoom on the 6” refractor has been the high performance of the Leica APO Televid on the Sharpless nebulae, as reported in
    Sh2-280, Sh2-282, Sh2-284, and Sh2-311 nebulae in March 2017

    The Leica Zoom itself covers the focus range of 8.9mm up to 17.8mm with the field of view up to 80°.
    The Baader triplet Barlow has the nominal factor of 2.25x.
    The shortest focus can be scaled from 4mm down to below 3mm when mounting the Baader helical focuser #2458125 insert tube between the Barlow and the zoom, as shown in the attached picture,

    Leica WW Zoom 25x - 50x ASPH plus Baader triplet Barlow.jpg

    This setup offers on my refractor the range of magnifications between 250x (exit pupil 0.6mm) and 42x (exit pupil 3.6mm), with a comfort of just one eyepiece, one Barlow, and one added tube insert.

    The targets for the terrestrial tests have been very fine textured white and yellow lichens on the roof about 60 meters away. Targets in the near field exclude effects of the low air turbulence.

    The zoom has been set to 40x, where the eyepiece optics delivers the best performance on the Leica APO 82mm Televid, and with the field of view close to 70°, like the Pentax XW.

    In the first test run, the magnification of the Leica zoom has been barlowed as close as possible to that of the Pentax XW: 214x, exit pupil 0.7mm. The test has been repeated several times changing the eyepieces. In all cases, the resolution of the finest textures in the lichens has been comparable, but the barlowed Leica has offered a visibly better contrast of the finest details.

    In the second test run, the magnification of the Leica zoom has been barlowed up to 250x, exit pupil 0.6mm. I have not identified more details, but the finest texture stood better out with still a surprisingly high contrast.

    In both tests the field has been sharp edge-to-edge, and without distracting distortion, as expected from an eyepiece with aspheric lens elements.

    Tests on the Moon will be done as soon as possible.

    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; Astrophotography: AstroTrac; Leica R7: Leica 2/50, 2/90mm, 2.8/180mm lenses
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    Default Re: Leica Zoom WW 25x – 50x ASPH and barlowed against the Pentax SMC XW 3.5mm

    Thanks for this JG: it sounds like a great, all-purpose eyepiece- and your comments back up the Cloudy Nights reviewer. I love the fact that it has such a wide FOV for a zoom: very unusual!

    It will be interesting to see how it goes on nebulae with the Synta refractor.

    All the best,

    Dean
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    Telescopes: 12" home-made dob, Celestron 150 f5, Tak TSA102, TV 76, Celestron 800CPC, ETX 125
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