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Mitakon lens Turbo, Speed Booster analog, available
  • Vitaliy_KiselevVitaliy_Kiselev

    image

    image

    • Ratio is 0.726
    • No electronics planned

    Newest adapters version MK II available on deals -

    http://www.personal-view.com/deals/adapters/mitakon

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  • 240 Replies sorted by
  • CFreakCFreak

    @brianc1959 From this very old post, thanks for your very good and through explanation!

  • Vitaliy_KiselevVitaliy_Kiselev

    Canon FD to Fujifilm FX

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  • brianc1959brianc1959

    @htpzt Very nice test. What is happening with the Lens Turbo is caused by the exit pupil distance of the Sigma 18-35. In this lens the exit pupil distance varies by a huge amount, from 70mm at the 35mm end to 150mm (e.g., nearly telecentric) at the 18mm wide end. Long exit pupil distances put big demands on focal reducers because they require larger element diameters. In order to achieve the larger element diameters you need to use the highest possible refractive index glass to reduce lens curvatures.

  • CFreakCFreak

    @htpzt this is a great comparison! You must have a good eye for detail! -Many thanks!

  • apefosapefos

    @htpzt Many thanks! I hope the Mitakon does not vignette with full frame lenses.

  • htpzthtpzt

    @apefos Here it is at F16. My Speedbooster is the old 0.71x version, the same as the new ultra.
    image
    The Lensturbo also gets a weird bright spot in the center and a bright ring around when stopped down (slightly exaggerated):
    image
    On the Metabones side it actually is a different picture everytime.

    ComparisonF16.jpg
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    P1000061.JPG
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  • apefosapefos

    @htpzt very useful tests!

    If not asking too much, could you do the same comparison with lens in f16, to see the black parts in corners?

    also, which version of speed booster you have?

  • htpzthtpzt

    @lmackreath I don't have a GH5 but a Nikon mount Sigma 18-35 F1.8 and both a Lensturbo 2 and a Speedbooster. Here is the Vignetting wide open at top to bottom 18-20-24-28-35mm on a GH2. Speedbooster is on the left.
    image

    Comparison.jpg
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    Comparison.jpg
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  • lmackreathlmackreath

    @htpzt do you have actual hands on experience with the lens turbo vignetting with the gh5 and the sigma 18-35 as I have conflicting reports to whether it vignettes or not?

  • lmackreathlmackreath

    would the sigma art 24 1.4 ff work?

  • lmackreathlmackreath

    Is there not a cheap alternative to metabones then that like the ultra does not vignette?

  • htpzthtpzt

    @lmackreath The sigma becomes useless at everything smaller than 28mm and even then it vignettes with faster apertures. I don't have any wide Nikon lenses on hand, but if I hold a M42 35mm lens in front, is seems to be a lot better than the sigma at 35mm with basically no vignetting. I will return my lensturbo and get a used Metabones ultra tomorrow.

  • lmackreathlmackreath

    @htpzt thanks.. so are we saying the lens turbo is useless at all Focal ranges on the sigma or only at the wide end?

    I don’t mind losing the first few mm and zooming if I have to

    And I assume the metabones ultra does not have this problem at all?

    And what full frame lens would work well With the lens turbo 2?

    Like would the nikkor 50mm 1.8 lens be suitable for this adapter?..

    [VK] Merged

  • htpzthtpzt

    @kmackreath
    I think it is only the Lens turbo failing. The Sigma 18-35 is designed to cover a Nikon DX sensor with a diagonal of 28.4mm. 28.4*0.726=20.6 which is still larger than the GH5's 19.9mm with 16:9 crop. The actual image circle of the lens at 18mm seems to be around 33mm, so an ideal focal reducer would produce a circle of 24mm. I measured only 19.2mm through the lens turbo.

  • lmackreathlmackreath

    sorry still confused..is this a failing of the lens turbo or all focal reducers with the sigma 18-35? does it vignette on the gh5 throughout the range or only at 18?..

  • htpzthtpzt

    @lmackreath
    The Nikon version has an aperture ring wich works with the Sigma lens, but it will vignette heavily with it, because the glass elements have smaller diameters compared to Metabones.
    The attached pictures are made on a GH2 so the GH5 will have about 1.08x crop due to the GH2's wider sensor.
    Edit: The Diameter of the front element is about 22mm and the diameter of the rear element about 19.5mm.

    18MM F1.8
    image

    18MM F16
    image

    35MM F1.8
    image

    35MM F16
    image

  • Vitaliy_KiselevVitaliy_Kiselev

    @lmackreath

    Ok...to confirm once and for all, the nikon g to mft version has an aperture ring?

    Yep, for lenses with mechanical aperture lever, not E.

    https://www.nikonimgsupport.com/ni/NI_article?articleNo=000004725&configured=1&lang=en_US

    does it vignette when used with the sigma 18-35 on the gh5?

    need to ask owners of all three things.

  • lmackreathlmackreath

    Ok...to confirm once and for all, the nikon g to mft version has an aperture ring? does it vignette when used with the sigma 18-35 on the gh5?

  • Vitaliy_KiselevVitaliy_Kiselev

    Lens Turbo II Nikon G-NEX

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    http://stkb.co.jp/info/?p=6973

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  • soulkeepersoulkeeper

    @Thor what's your setup for using hellios (m42mount) with a mitakon II ef to m4/3?

  • Vitaliy_KiselevVitaliy_Kiselev

    PR

    The Fuji X Camera Lens Turbo Adapter (Ver II) from Mitakon allows lenses to be mounted to APS-C format Fuji cameras, increasing the angle of view by 0.726x and the maximum aperture of the lens by 1 f-stop.

    The four optical elements of the Lens Turbo adapter condense light from the full frame lens and project it onto the camera’s sensor allowing the sensor to capture all of the transmitted light, negating the crop factor and effectively producing full-frame coverage on non-full-frame sensors. A corresponding increase in the maximum aperture of 1 f-stop makes the lens more effective in low-light situations.

    This adapter features 4 optical elements including one extra-low dispersion (ED) element which reduces aberrations for better delineated images. The adapter offers a sturdy metal construction and stainless steel mounts, it attaches to both camera and lens with little play and includes a front and rear protective cap. The Lens Turbo is a manual adapter offering no electronic communication between lens and camera. It is not compatible with Blackmagic cinema cameras.

    • Allows lens to be mounted to Fuji X camera
    • Increases the angle of view by 0.726
    • Increases maximum aperture by 1 stop
    • 4 lens elements in 4 groups including 1 extra-low dispersion element

    This lens turbo adaptor may not fit all lenses due to different extensions at the lens rear mount. Lenses with extension more than 3mm are not recommended to use this lens turbo adaptor. Vignetting may occur if using APS-C lenses.

  • Vitaliy_KiselevVitaliy_Kiselev

    Nikon G / FX adapter

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  • ThorThor

    Hi everyone! My wife made paper town, and I shot it using Mitakon EF to M43, and my lovely favorit Helios 77m-4.

  • MikeLinnMikeLinn

  • CFreakCFreak

    The flange focal distance is too long, that can't be shimmed or fixed (if it focused past infinity it could be shimmed and fixed. Contact the seller ASAP, if there's a simple fix (like they put too many shims n the damn thing) but chances are it;'s a bad example/ the optics are not quite right (there's a lot of factors) and you should return it with in your period, if they don't respond., and if they do respond, ask for an extension in writing. Chances are you'll be sending it back.

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