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Newbie with some questions, help is appreciated!

Started Jun 12, 2016 | Questions thread
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Eugg1 Regular Member • Posts: 107
Newbie with some questions, help is appreciated!

Hi all, 
I'm new to the underwater photography world so apologies if these are basic questions. After reading information online, I seem to find on a lot of websites that f/8 is recommended for underwater photography with wide angle shots. However, I don't get it....

- I am planning to buy an Olympus 8mm f/1.8 fisheye lens. Isn't the f/1.8 very useful to keep ISO low and get a higher quality image? Why would I want to shoot this lens at f/8 considering that the fisheye has a lot of 'natural' depth of field, even at f/1.8..? What is the reason that high aperture numbers are recommended for underwater work?

- Furthermore, the use of strobes is also recommended. What about shots close to the surface? For example close up fisheye shots of sharks/dolphins near the surface? Isn't that nicer with natural light? Or is a strobe always recommended?

- Lastly, when making split images (top/under) during daylight hours, are strobes needed? Or only when the 'under' shot is too dark?

Hope someone can help me with this!
Thanks in advance

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