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#1 |
Major Player
Join Date: May 2007
Location: Bethesda, MD
Posts: 404
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Annoying curvature lines
Hello,
On many of the footage I see online I'm noticing a lot of curvature lines from the footage of the GoPro Hero4, Silver and Black. Recently somebody made a movie called Tangerine, with three Iphones. That made me though that the GoPro cams could be at least as good if not better than iphones. But I simply can't get over these curvature lines. I'm wondering if the GoPro can be used for fiction? What does anybody think here? Thanks |
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#2 | |
Trustee
Join Date: Mar 2011
Location: New Haven, CT
Posts: 1,004
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Re: Annoying curvature lines
Quote:
1. In shooting 4K, you can while shooting minimize curvature by avoiding straight-line objects and people at the edges *or* you can correct curvature in post (the GoPro software has a plug-in specifically for this). You can also use curvature (sparingly) purposely for creative effects. Fish-eye is a look. 2. In shooting 2.7K, you can choose 'Medium' POV (there is no choice of POV for 4K), which has minimal curvature. Both resolutions are better than the iPhone, and you can even shoot 2.7K at 60fps for smooth motion or slo-mo. Or 24P if you want a film look for either resolution. |
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#3 |
Major Player
Join Date: May 2007
Location: Bethesda, MD
Posts: 404
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Re: Annoying curvature lines
Thanks Mark.
Avoiding straight-line objects is not really an option though. |
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#4 | |
Trustee
Join Date: Mar 2011
Location: New Haven, CT
Posts: 1,004
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Re: Annoying curvature lines
Quote:
Here is a 4K video shot without any correction, but with judicious framing to minimize curvature: |
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#5 |
Trustee
Join Date: May 2007
Location: Minneapolis, MN
Posts: 1,313
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Re: Annoying curvature lines
Have you thought about modifying your Hero4 with an aftermarket rectilinear CCTV lens? Did mine for about $100. It's pretty sweet. No more curvy lamp posts.
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#6 |
Major Player
Join Date: Dec 2008
Location: Canyon Country, CA
Posts: 445
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Re: Annoying curvature lines
I did that, and found the image quality was maybe good enough for HD, but not for 4K. I went back to the normal GoPro lens.
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#7 |
Trustee
Join Date: May 2007
Location: Minneapolis, MN
Posts: 1,313
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Re: Annoying curvature lines
Charles, which lens did you try out? The 5.4mm looks very sharp to my eye in 4k.
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#8 |
Major Player
Join Date: Sep 2003
Location: Rego Park , NYC
Posts: 665
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Re: Annoying curvature lines
How about fixing it in software?
This plugin looks intriguing. Fisheye Fixer for GoProŽ - Fisheye Correction FCPX plugin | CrumplePop And this free one for FCPX: http://alex4d.com/7-alex4d-wide-angle-fix-effect I didn't realize GoPro also software in to fix it. Might have to look at one of these cameras. |
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#9 |
Major Player
Join Date: Dec 2008
Location: Canyon Country, CA
Posts: 445
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Re: Annoying curvature lines
Glad to hear that. Yes, I tried the 5.4mm, and it was sharp in the center, but the sharpness dropped off drastically toward the both sides. Perhaps there is lens to lens variation, or maybe I had a poor installation. I had high hopes for 4K video, and if people continue to report good results I may try again in a year or so.
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