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Differences between Sigma 8mm f3.5 and Samyang/Rokinin 8mm f3.5

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  • Differences between Sigma 8mm f3.5 and Samyang/Rokinin 8mm f3.5

    Hello,

    As a GTiP I am switching my 360 set up from a D90 with Siggy 8mm f3.5 using R10 GTP kit to a Sony A77ii with a Rokinin 8mm CSII f3.5.

    I am looking at the R1 rotator with adapter to mate it to my RD16 that I use with an NN4. Will this work?

    As well, with the Rokinon 8mm, will I get the same results as the 8mm sigma if I set the R1 at 7.5 degrees and go 4 shots around. Will my zenith be complete and have just a small black nadir hole to patch up or fill with a logo?

    Thank you very much for any help you can offer!
    Sony A-57 & A-77ii
    Rokinon 8mm F3.5
    70-210 F4.0
    28-105, 28mm, 50mm,
    Sigma 10-20
    Manfrotto HK294
    Nodal Ninja 4 with RD 16 rotator and Nadir adapter
    Wireless shutter release, Cable release
    PTgui Pro - Panotour Pro - PS Cs5

  • #2
    Sony A-57 & A-77ii
    Rokinon 8mm F3.5
    70-210 F4.0
    28-105, 28mm, 50mm,
    Sigma 10-20
    Manfrotto HK294
    Nodal Ninja 4 with RD 16 rotator and Nadir adapter
    Wireless shutter release, Cable release
    PTgui Pro - Panotour Pro - PS Cs5

    Comment


    • #3
      Hello Russell, do you own NN4 RD16 already. If yes it looks like it would be a path with the least friction for your Samyang/Rokinon lens.
      The Rokinin 8mm CSII f3.5 has a different field of view (a bit less is visible) and also it's a rectiliear(ish) fisheye as opposed to the circular image produced by Sigma.
      The minimum official shooting scheme with your Sony A77ii is 4 shots around, tilted to 15 degrees below horizon, and an extra zenith shot.
      The recommended official shooting is 5 or 6 shots around, tilted 15 degrees down, and two extra zenith shots, tilted 60 degrees above horizon.
      I am not 100% sure but there might also be good options when you rotate this lens diagonally in an R1 - but I'm sure this would make the stitching more difficult and more prone to errors due to the shifts of NPP (the Rokinon has a complicated distortion in corners).

      Best
      Jan
      Last edited by jvr; 09-16-2016, 02:22 AM. Reason: added note that this schooting scheme applies to Sony A77ii (1.5 crop factor). With a full frame camera it would be easier.
      --
      Jan Vrsinsky
      Nodal Ninja Reseller in Czech Republic

      Comment


      • #4
        Hi JVR,

        Thank you for your help!
        Sony A-57 & A-77ii
        Rokinon 8mm F3.5
        70-210 F4.0
        28-105, 28mm, 50mm,
        Sigma 10-20
        Manfrotto HK294
        Nodal Ninja 4 with RD 16 rotator and Nadir adapter
        Wireless shutter release, Cable release
        PTgui Pro - Panotour Pro - PS Cs5

        Comment

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