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Thread: De-fish software Samyang 7.5 for 4/3rds

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    Subscriber Member kit laughlin's Avatar
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    De-fish software Samyang 7.5 for 4/3rds

    Hello all,

    Hemi Fish does not work for me; it leave one set of lines in interiors curved. I would like a rectilinear result.

    I bought this for interiors. Any workflow suggestions? I use PS4, Aperture, and Capture 9 Pro.

    TIA, KL

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    Senior Member danielmoore's Avatar
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    Re: De-fish software Samyang 7.5 for 4/3rds

    If you have PTGui or another stitching program that allows to assign straight line control points you could pick an interior image with plenty of well spaced vertical elements and manually correct one image. Once that's done to your satisfaction you can save that lens profile to the lens database and apply it without needing to use control points again. The interpolation algorithms, especially Sinc 36 through 256, do an amazing job (assuming you're using PTGui). If you would like any help with that just let me know.

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    Subscriber Member kit laughlin's Avatar
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    Re: De-fish software Samyang 7.5 for 4/3rds

    Thanks for that suggestion, Daniel. I will look further into PTGui; is there a tutorial for using PT the way you suggest? Cheers, KL

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    Senior Member danielmoore's Avatar
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    Re: De-fish software Samyang 7.5 for 4/3rds

    I had a quick look around the web and didn't find exactly what I alluded to. It's so easy when you see how that if you sent me an image shot with that lens with multiple 'vertical' lines across the frame I should be able to work up a video of the correction process.

    Interestingly enough, this all reminds me of when I first learned of Jacks prowess in defishing the canon 15mm, many years ago. Around the time of the 10D.

    And I'd be remiss if I didn't thank Helmut Dersch for Panorama tools. As far as I know, he's the father of lens correction profiles. For the digital age, at least.

    https://en.wikipedia.org/wiki/Panorama_Tools

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    Subscriber Member kit laughlin's Avatar
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    Re: De-fish software Samyang 7.5 for 4/3rds

    In the meantime I have been watching Florian Knorn's tutorials in PTGui; it does seem like a remarkable program. I assume I need the standard version, rather than the 'pro' one.

    I will take a typical image for you today; the Samyang 7.5 covers the full frame on 4/3rds so (shooting the interior I have in mind) shows wider than 90 (if the camera is in the corner of a room, you see the adjoining L and R walls as well as everything in between). It was this feature that drew me to the fines originally.

    Will WeTransfer work for you re. sending you a jpeg, or is there a better way? If I use WeTransfer, I will need an email address. Mine is kit_l at mac dot com.

    Cheers and sincere thanks, KL

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    Senior Member danielmoore's Avatar
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    Re: De-fish software Samyang 7.5 for 4/3rds

    The more 'vertical' lines spread throughout, especially at the edges, the better for calibrating. You can always make a more perfect calibration when the subject presents itself if you can't now. Any image will do for the setup. You can probably just email me a <20MB jpg at full res of course. I'll email you in a moment for convenience. I have used PTGui for many many years and have never needed the pro features myself.

    Glad to help.
    Last edited by danielmoore; 28th January 2016 at 12:53.

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