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Thread: Leica B40x (f=11mm) against Leitz Periplan, Swarovski, and Pentax XW

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    Default Leica B40x (f=11mm) against Leitz Periplan, Swarovski, and Pentax XW



    Hello all,

    with the recently acquired Leica B40x f=11mm, I have completed the set of the Leica 77mm spotting scope eyepieces,

    Leica Televid Eyepieces.jpg

    The Leica B40x has the following specifications:
    Coatings: Fully multicoated, amber color
    Lenses: (2 – field stop - 1 - 2 - 1), field lens concave out, eye lens flat out
    Focus length: 11mm
    AFOV: 50°
    Eye relief: ca 12mm (estimated)
    Distortion: Light pincushion on the 6” F/5 achromatic refractor
    Dimensions: Length wit fully retracted eyeguard 55.5mm, maximum diameter 45mm
    Weight: 90.7g
    The eyepiece requires a bayonet-to-1.25”/2” tube

    The bayonets on the Leica eyepieces are shown here,

    Leica Televid Eyepieces and differences in bayonet.jpg

    The comparison includes:
    Leica B40x f=11mm Leica Televid (77mm) spotting scope eyepiece
    Pentax XW f=10mm astronomy and spotting eyepiece
    Swarovski SW 45x f=10.2mm spotting eyepiece,
    Leitz Periplan GF 25x f=10mm microscope eyepiece

    Leica Pentax Swaro Leitz 25x.jpg

    These eyepiece complete also the group of my f=10mm up to 11mm eyepieces for the 6” F/5 Synta (Sky-Watcher) achromatic refractor.

    The core of the terrestrial tests on the 6” F/5 achro have been the lichens on a roof of a house about 80m far away.

    The panel mosaic shows the images in the center field, taken through the Olympus 1.8/25 lens on the Panasonic Lumix GF7 camera,

    Leica Leitz Swaro Pentax annotated.jpg

    The best sharpness reveals the Leica B40x, followed by the Leitz Periplan GF 25x.
    The highest contrast show the Swarovski 45x S W with the Leitz Periplan GF 25x, followed by the Leica B40x.
    The best CA compensation control reveals the Leica B40x followed by Swarovski 45x S W
    Leitz Periplan GF 25x is very well compensated in blue, but undercompensated in red.
    Pentax XW 10 seems to suffer from a random CA noise.

    As any rating by a reviewer is subjectively biased by his preferences, and as a digital photography eventually resolves details hardly perceived visually at the eyepiece, I put all these 4 eyepieces in to the class of top performers.

    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, 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 B40x (f=11mm) against Leitz Periplan, Swarovski, and Pentax XW

    Thank you again JG for sharing your findings on this subject, which is at the heart of your interest.
    Your presentations are very much appreciated renderings of your expertise and experience.
    This is one of the highlights of this forum!
    The best you you Sir!
    j.gardavsky likes this.
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    Default Re: Leica B40x (f=11mm) against Leitz Periplan, Swarovski, and Pentax XW

    Thanks so much. I really appreciate your assembling the images into one so that comparison is easy.

    However... I think I just lost interest in the Pentax XW.
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    EQG

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    Default Re: Leica B40x (f=11mm) against Leitz Periplan, Swarovski, and Pentax XW

    Quote Originally Posted by not_Fritz_Argelander View Post
    ...

    However... I think I just lost interest in the Pentax XW.
    Hello not_Fitz,

    with the Pentax XW, Vixen LVW, etc., you get a very long eye relief in wide field, but you eventually loose some of the contrast and sharpness performance.

    Some time ago, I run a test between the Pentax XW 10 and the Swarovski SW 45x on the "Leo's Head" galaxy NGC 2903,
    and the Swaro has shown the N-S spiral arm, but the Pentax XW not.
    On the other hand, the Pentax XW eyepieces have a very high transmissivity in blue/violet, which helps on some other galaxies.

    If anybody is looking for a cheap f=15mm AFOV 70°, then the military grade Hensoldt from the army surplus may be an alternative, https://www.ebay.at/itm/2-Stuck-f15-...YAAOSwQz1bJQ35 , however, the eye relief is not enough for the glass wearers. I like this eyepiece very much.
    Astrooptik in Berlin looks like a one-man shop making the adapters for the military surplus optics according to your specifications. I have never been shopping there, but they look like a good source for surplus optics for astronomy.


    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 B40x (f=11mm) against Leitz Periplan, Swarovski, and Pentax XW

    Nicely done and well presented, JG. Thanks much for this!
    j.gardavsky likes this.
    Bryan

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