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FORUMS Photo Sharing & Visual Enjoyment Underwater Photography 
Thread started 31 May 2018 (Thursday) 08:16
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Hyperfocal distance underwater and at water level.

 
EOlsenPhoto
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Location: Michigan
     
May 31, 2018 08:16 |  #1

Hey all.

I was wondering if anyone could get deep and detailed on explaining how to achieve hyperlocal distance while shooting with both dome and flat ports in and at the waters surface? With a dome port it is clear that the shape of the dome has a drastic effect on focus distance, I grasp a touch of the physics involved in this but cant really put it into practical use.

I am looking to close down my aperture and shoot largely in manual focus but notice through trial and error I am having varied success and it is not working the same as a camera out of a housing.

I think some irrelevant details might be: 5d mk IV or 1dx mk II in aquatech housings with a mix of dome and flat ports, lenses range from 16-35 2.8 mkiii, 24-70 2.8 mk II or 135 f2 predominantly.

I am close to calling up aquatech and begging them for a lesson. Hope this helps having a discussion here.

Thank you!

Erik


Erik
ErikOlsenPhoto.com

  
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fish_shooter
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Location: Alaska
     
Jun 06, 2018 18:29 |  #2

You can find the formulas for doing calculations here:
https://www.scubageek.​com/articles/wwwdome.h​tml (external link)

Basically it is far too complicated to explain in one post!

The bottom line is that if you want to focus both above and below water doing what is called an over/under shot, use a fisheye lens with a very large dome port such as a superdome (9" diameter). The only way to get reasonable focus above and underwater at the same time if that is what you are trying to do.
Tom


http://www.salmonograp​hy.com/ (external link)

  
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Hyperfocal distance underwater and at water level.
FORUMS Photo Sharing & Visual Enjoyment Underwater Photography 
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