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GoPro U/W FOV

GoPro FOV

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#1 Timmoranuk

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Posted 29 April 2018 - 04:31 AM

I am presently working on a 5 GoPro (Hero 4 Black) array. The GPs will be housed in iQsub 150m housings with flat ports and will be scooter mounted to provide overlapping FOVs for both video and photogrammetry applications.Could anyone please advise me of the resulting U/W FOV (vertical horizontal and diagonal):

 

1. 16:9 wide (topside FOV: 69.5, 118.2, 133.6)

2. 4:3 wide (topside FOV: 94.4, 122.6, 149.2)

 

(https://gopro.com/he...FOV-Information)

 

For the purpose of topside setup it would also be useful to know which settings will reasonably duplicate the reduced U/W FOVs.

 

Many thanks in advance, Tim


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#2 huwporter

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Posted 04 June 2018 - 03:21 AM

The GoPro semi-fisheye lens at wide setting behind a flat port underwater has a field of view roughly similar to something like an 18-20mm (35mm equivalent) rectilinear lens.

 

The maximum possible angle of view through a flat port is somewhere around 96-97 degrees; you can confirm this with Snell's law.  Practically, the diagonal 133 degrees FOV turns into about 90 degrees and as a side effect the fisheye effect gets mostly kinda corrected to rectilinear.  You can't easily replicate that above water with settings because of the fisheye effect above the water.


Edited by huwporter, 04 June 2018 - 03:27 AM.