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A Guide to Underwater Wildlife Video & Editing: Part 6
Read Part 5 here.
A part serialisation of a book by Jeff Goodman
PART 6: Lenses, Depth of Field, Angle of Coverage
I guess one could write a whole book on lenses, their applications and relationship with exposure i.e. shutter speeds and aperture (f stops) and depth of field, but for the sake of this guide I will just cover the basics. And I do mean the basics.
A rule of thumb with taking a lens underwater is that because of the different refractive index of water to air, the angle of coverage of the lens will decrease by 1/3rd as soon as it is submerged, as the diagram shows.
B
A
A 90 degree lens (A) on land is only going to cover 60 degrees (B) underwater. So what are the implications of this?
Because of the nature of filming underwater and the probability of there being some sort of debris affecting visibility, then it is generally preferable to get as close to the subject as possible to get a good crisp, clear picture. Hence the general use of wide angle lenses rather than standard or telephoto.
What has this to do with focus and depth of field? First of all what is depth of field? Looking at the diagram we see a telephoto lens focused on an object at a distance of say 3 metres. Taking an average exposure and thinking purely in generic terms, an object (A) placed say 3 metres away when focused upon will of course be sharp. The area marked in front and behind the object will also be sharp. So the depth of field is taken as the distance between points B and C. Everything outside of that area will be out of focus.
Telephoto lens
With a standard lens you can see that the depth of field, with all other factors being equal, will be far greater.
Standard Lens
Wide Angle lens
With a wide angle lens the depth of field is greater still and will probably be from the lens front to infinity. This does vary depending where the focal point A is in the first place and the f stop of the lens, but generally the wider the lens the greater the angle of coverage and the greater the depth of field.
So for underwater work a wide angle lens is greatly preferable to any other as it allows you the possibility of getting close to your subject and maintaining a good depth of field.
Please do look up ‘depth of field’ if you want more information on how this all works, but generally, depth of field is governed by the aperture (or f-stop) of the lens and this aperture is directly affected by the shutter speed, which in turn is affected by the gain. The slower the shutter speed the smaller the aperture of the lens can be and the smaller the aperture the greater the depth of field. But, if your shutter speed becomes too slow, say less than 1/50th of a second then your video images may start to take on a blurry look. Ideally a 1/50th to 1/60th is good. Auto exposure will balance these three items against each other to give you the best overall exposure.
Higher shutter speeds are good for capturing fast action with nice sharp results, but the penalty you pay is the overall loss of light through the lens. This means that the aperture will have to be larger to let in more light to give a good exposure and that in turn will reduce the depth of field.
Starting to get a little cross-eyed? Don’t worry about it unless you are going to take up videography in some professional way or you really want to know what is going on in your camera. Otherwise be content with simply adjusting the ‘exposure’ dial until the picture on the monitor looks good.
Next time we look at Flat and Dome Ports.
3rd AUGUST 2024 – 1 or 2 WEEK PROGRAMMES
Daily water programme with Snorkelling & Scuba Diving.
Beginners or qualified, something for all.
Leave the kids with the Splash Team for days of Excitement, Fun & Adventure!
BOOK NOW: INFO@PHARAOHDIVECLUB.COM / TEL: +44 7598 329059 or +20 100 6822000
There are various options for accommodation with options for 2, 3, 4 or 5 guests.
Eco Huts provide accommodation for families of up to 4. The best option to enhance the adventure and closest to camping with basic facilities. For August we will provide central air cooling for all the Eco Huts.
Deluxe Chalets are only suitable for 2 guests. Fully air conditioned rooms with private bathroom and other facilities.
Boutique Rooms are available for families of up to 5.
Individual bespoke rooms fully air conditioned with private bathroom and other facilities.
Eco Huts: £675 per adult / £425 per child / Under 8 FREE of charge
Deluxe Chalet: £830 per adult / £505 per child / Under 8 FREE of charge
Boutique Room: £925 per adult / £550 per child / Under 8 FREE of charge
BOOK NOW: INFO@PHARAOHDIVECLUB.COM / TEL: +44 7598 329059 or +20 100 6822000
This is a truly unique opportunity to have a Family Desert Adventure totally away from it all! You will be based at the remote Roots Red Sea on the coast of the Egyptian Eastern Desert, 140km south of Hurghada city.
Red Sea Splash main focus is Snorkelling & Scuba Diving but that’s not all, we provide a rounded week of activities in support.
Pool& Field Games – Arts & Crafts
Marine Biology Workshops
Cultural Activities – Orienteering Adventures
Roots Red Sea have established strong links with the local communities of Hamerwain & El Quseir affording our guests to have a true taste of the local culture, SPLASH CAMP embraces this opportunity and bring in the local children to join in the fun with our adventure seekers.
During the day, families are welcome to take part in all activities together or the kids can be left with the SPLASH CAMP team while the parents enjoy the facilities or go diving themselves!
At the end of the day, its family time while the SPLASH CAMP team take a break. For those with the energy, there are family evening activities planned a few evenings.
Open Air Movie Night – Desert Star Gazing Walk & Talk
El Quseir Evening City Tour
The second week is very special, we head off on the Big Blue for a liveaboard safari around Fury Shoals.
BOOK NOW: INFO@PHARAOHDIVECLUB.COM / TEL: +44 7598 329059 or +20 100 6822000
U-8 Splash Club
Sadly we can’t offer Scuba Diving to the Splash Club but we can have lots of fun Snorkelling & Free Diving!
Splash Club includes:
Certified Snorkel Course – Marine ID Games – Intro to Free Diving
Arts & Craft Sessions – Adventure trails – Cultural Playtime – Pool Games
U-12 Explorer Club
In addition to an exciting snorkelling and Free Diving Programme in the Splash Club we can take you under the water on SCUBA to a whole new world of fun and wonder. If you are under 10 your first breath under water will be as a Bubblemaker and continue with daily Seal Team Missions. From 10 we will complete a Discover Scuba Diving experience in the amazing Red Sea. Alternatively we offer a full junior certification programme to become an international qualified Scuba Diver.
U-16 Adventurer Club
For qualified Scuba Divers regardless of age it’s the Adventurer Club and exploration of the local reefs and marine life. There will be 2 dives every day with the Open Ocean marine field station team who will introduce you to Red Sea marine life and workshops on marine research. Alternatively there are opportunities to continue your scuba diving certifications with our instructional team.
Parents are welcome to join the club activities and join the courses.
BOOK NOW: INFO@PHARAOHDIVECLUB.COM / TEL: +44 7598 329059 or +20 100 6822000
Big Blue might seem like the new kid on the block, but the team behind the highly acclaimed liveaboard is far from that. They have been running Red Sea safaris since the late 1980’s and were in fact part of the early pioneers who ventured out to the unknown on vessels that in today’s world, really shouldn’t have left the harbour! It’s that experience and the years of operating the award-winning Roots Red Sea resort which truly set Big Blue apart from the crowd!
Large lounge area, spacious sun deck and terrace deck.
Airy restaurant with five tables with up to six chairs per table, serving a varied and delicious menu with special dietary requirements catered for.
The spacious cabins have side by side beds and a large walk in wet bathroom.
Ample dive deck for divers & snorkelers.
Safety is everyone’s priority, whether you are relaxing on board, swimming, snorkelling or diving.
On board Big Blue is fitted with smoke alarms, emergency lighting and a fire alarm system. The lower corridor has a full-size door fire exit at the bow and open stairs to the stern. There are evacuation plans in each room along with life jackets, glass breaker tool and a fire extinguisher.
BOOK NOW: INFO@PHARAOHDIVECLUB.COM / TEL: +44 7598 329059 or +20 100 6822000
Red Sea Splash at Fury Shoals is a very rare opportunity to get involved with marine biology expedition for children and adults. Open Ocean biologists are on board to provide fascinating and entertaining facts about the marine life you will see. The team will provide workshops on marine life identification and survey methods both of which, should you wish, you will have the chance to put into practice during your safari.
The week is open to snorkelers, scuba divers and non divers too!
Fury shoals is perfect for first time mariners as it offers plenty of protection from the weather.
We board at Port Ghaleb on Saturday evening and prepare to set sail early on Sunday morning.
Heading south, our first day will be diving the reefs of Abu Dabbab before sailing overnight to reach our ultimate destination the Fury Shoals.
Here we will spend four days swimming, snorkelling and scuba diving amazing reefs. This includes guaranteed DOLPHIN encounters at Sataya Reef! After the last dive we haul anchor and head back to Abu Dabbab for our final two dives before disembarking our boat BIG BLUE.
Camp Extension Cost*
Adult £650 per adult
Under 16 £350 per child
BOOK NOW: INFO@PHARAOHDIVECLUB.COM / TEL: +44 7598 329059 or +20 100 6822000
FURTHER INFORMATION – INFO@PHARAOHDIVECLUB.COM
TEL: +44 7598 329059 or +20 100 6822000
If you’re passionate about the underwater world, listen up! We’ve got an incredible opportunity for you to experience the vibrant reefs and majestic marine life of Nusa Penida, Bali, Indonesia.
info@purediveresort.com / +62 811 3999852 / www.purediveresort.com
Pure Dive Resort isn’t just another dive centre; it’s a team of experts dedicated to providing world-class scuba diving and freediving adventures around Nusa Penida, Lembongan, Ceningan, and even Bali.
info@purediveresort.com / +62 811 3999852 / www.purediveresort.com
Whether you’re a seasoned diver or completely new to the sport, Pure Dive Resort has something for you:
For certified Divers: Discover stunning dive sites, encounter manta rays, seasonal mola-mola (sunfish), and a dazzling array of marine life.
For beginners: Embark on your scuba journey with beginner programs like Try Scuba and Basic Diver, Open Water and Advanced certifications.
Freedivers: Explore the depths on a single breath with guided freediving experiences and courses.
Exclusive Scubaverse Offer: Save on Your Next Adventure
As a valued Scubaverse follower, you get an exclusive 10% discount on any Dive & Stay or Learn & Stay package booked at Pure Dive Resort for 2024. Dive into the crystal-clear waters, explore breath-taking reefs, and create unforgettable memories in this diver’s paradise.
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info@purediveresort.com / +62 811 3999852 / www.purediveresort.com
Ready to make a splash?
See you in Nusa Penida!
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