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My obsession with preparing and cleaning my underwater housing and lens

Continually concerned with underwater housing leaks, and having experienced a number of images and videos ruined by dust or other material on the lenses, I border on obsessive when preparing and cleaning my underwater housing lens.

Underwater housing lenses suffer the usual problems of dust and lint, but are also susceptible to things like sunscreen (my pet hate), salt residue, sand and other nasties.

Whenever I travel through Cairns, I always stop in to visit the friendly staff at  Digital Diver and pick up cleaning accessories.

Preparation Tips

I follow a set procedure each time for housing preparation:-

  1. Remove the main o-ring and use a lint-free cloth to wipe around the o-ring groove, removing any excess silicon, sand or hair that may have lodged in the groove. A piece of hair or sand under the o-ring can cause the housing to leak. (Tip:- use a plastic credit card to remove the o-ring so you do not damage it. I use my cert card as a reminder for me to take it diving).
  2. Use a second lint-free lens cleaning cloth on the inside and outside of the underwater housing lens to remove dust, lint or finger marks.
  3. Unfortunately cloths can adsorb oils and spread them around. My new favourite cleaning accessory is lens cleaning tissue paper. lens cleaning tissue (more…)

Which Canon Powershot to buy for underwater photography – G10, G11 or G12?

An email received today asked for my advice on choosing a Canon Powershot G10 or G11 for underwater photography. There are a number of things to take into account, so I thought I would cover a few in a post.

I received the following email enquiry today:-

“Carl, Please counsel with me on a camera purchase. I am putting together an underwater system and wish to use the Canon G10 or G11. I will get the Canon underwater case. Should I get a near new G10 (ie. from Craigslist – approx. $450 US) or get the G11. Please advise. Thanks! Darrell”

Thanks to Darrell for the question.

I am a keen user of the Canon Powershot G Series cameras for underwater photography, and have owned a G10 and G11 camera.

The G10 vs G11

The G10 and G11 are both good cameras and popular with many professional photographers. There are a few new functions in the G11, but the fundamental differences are:-

  • G10 has 15MP sensor, G11 has 10 MP sensor.
  • G10 has a flat screen back, G11 has a flip screen back.

The smaller sensor on the G11 provides better in-camera noise performance (see my previous post Noise Comparison – Canon Powershot G11 vs G10). I find noise can become an issue underwater, particularly when you are going deeper where there is less natural light.

Using an external flash or video light helps to keep the shutter speeds fast at those deeper depths, reducing noise.

Noise is also becoming less of a problem in post processing. Particularly if you are using Adobe Lightroom 3 with its new software engine, which is doing incredible things with noise reduction. (I have to regularly stop myself going back to old images and improving the noise, as I would never get anything else done.)

I also like the G11 flip screen for taking pictures from different angles, but in the underwater housing it does not make any difference.

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New Pictures – Telecommunications dish antenna for transferring signals over satellite

During a recent trip to Barbados I happened to notice the telecommunications dish antenna used for transferring telephone calls and signals over satellite. I could not resist taking the following shots with the blue sky and cloud formations in the background.

Barbados is actually quite well connected. The island is linked to other Eastern Caribbean islands and the rest of the world via undersea fibre optic cable, and satellite systems (such as that pictured).

Satellite telecom earth station dish antennaTelecommunications dish antenna used for transferring signals over satellite.

Television is also delivered to the island via satellite.

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Travel updates and visa requirements for US and Barbados

Travelling to the U.S and Caribbean, I have noticed a few changes to visa requirements and other odd bits of information worth sharing.

U.S Immigration Forms

After a year and a half of testing, the U.S has finally switched on the ESTA (Electronic System for Travel Authorization) pre-approval entry system for selected countries. During the testing phase, even if you had completed an ESTA application online, travellers still had to fill out the green visa waiver immigration form and the customs form.

Airport terminal check-in desk - Cairns International (Carl Chapman)With ETSA now fully active, the green immigration form is no longer needed, so visitors on the visa waiver program only complete the customs form.

Barbados Visa Changes

Citizens of several countries (e.g China) visiting Barbados have until recently been able to buy a visa at the point of entry. This has changed and they now require a visa before travel. Unfortunately this is not documented on the Barbados Immigration website or other travel sites yet.

I was travelling to Barbados with a colleague from China. All the websites and travel agents had said he could purchase a visa on entry. When he turned up for the flight at Miami airport,  the airline computer system said he needed a visa to travel, and they would not let him on the plane. He went down to the Barbados consulate in Miami and was told it would be two weeks to process. They also informed him the changes had not been documented on the official website yet.

Change to MIA Admirals Lounge

The Admirals lounge on Miami airport’s E Concourse will be closing down in September, and relocating to the newly finished American Airlines area, originally known as A or B  course. Currently there is also the larger Admirals lounge on D concourse.

Hilton Hotel Travel Deals

I stayed a night at a Hilton hotel, and on checkout received a piece of paper saying Hilton hotels are  running a summer promotion over August and September with selected U.S hotels offering 20% off the best available rate when you book in advance. See the Hilton website for details.

Keep the subject in focus and let the camera do the work

Catching the video of fighting Reef Cuttlefish (Sepia latimanus) on a recent dive, some words from The Underwater Photographer by Martin Edge came to mind … ” Keep the subject in focus, and let the camera do the work”.

In his book, Martin describes an occasion when he and a group of other divers came across some dolphins. Starting to think about exposure and other settings, Martin decided there was no time, and chose to keep the subject in focus and let the camera do the work. He was able to get the shot while others were still playing with their cameras.

In underwater photography, you often have time to set-up your camera to create a shot. However, sometimes you see something and with no time to choose the appropriate settings, just have go with what you have to get the shot.

This is exactly what happened during a dive on Friday at Agincourt Reef  on the Great Barrier Reef with Quicksilver’s Silversonic.

We entered the water for our third dive of the day. I had just reached the bottom with the other divers of our group still on the way down. Checking my camera housing to make sure there were no leaks, I spotted a Cuttlefish (Sepia latimanus) out the corner of my eye.

My camera housing still had bubbles around it, and struggling to read the screen settings, I managed to get it into video mode. I started thinking white balance, lighting, etc …. and decided I had no time.

Getting the Cuttlefish in the screen, I hit the record button, hoping the camera would have the correct focus. Cuttlefish are able to rapidly change colours to blend in with their surroundings, and this can often confuse the camera focusing system.

Trying to keep the subject in the screen, we got more than expected with the following video.


Fighting Cuttlefish (Sepia latimanus) – Viewable on Vimeo and Youtube

The Cuttlefish made its way towards another one, changed colour from light grey to black, and attacked the second one. They then separated and went opposite directions…. something you don’t see ever day, and a great example of their ability to change color.

Forty seconds from touching the bottom, and the whole event was over.  Had I been deciding between stills and video, or been messing around with settings or lighting, I would have missed to whole thing.

Sometimes to get the shot, you just have to keep the subject in focus, cross your fingers and let the camera do the work.

How to use the Canon G11 Control Dial in an Underwater Housing

For a while now I have been under the impression you could not use the Control Dial on the Canon Powershot G11 when it was mounted in an underwater housing, but a recent review by Lawrence Alex Wu reveals a little known secret.

I was reading Underwater Photography Magazine (No 55 Jul/Aug 2010), and a review of the Canon Powershot G11 by Lawrence Alex Wu describes a key shortcut that allows the photographer access to the Control Dial functionality while underwater.

Canon Powershot G11 inside wp-dc34 underwater housing

Out of the housing, rotating the G11 Control Dial next to the screen allows you to adjust settings that include:-

  • Aperture size in Aperture Priority Mode (AV)
  • Shutter speed in Shutter Priority Mode (Tv)
  • Metering Modes
  • Manual Focus
  • Brightness Exposure Compensation
  • Auto Exposure Bracketing

I often use the Canon WP-DC34 underwater housing with my G11 camera, but the problem is that once you close the housing you no longer have access to the control dial…. or so I thought….

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Cairns Underwater Film Festival – 7 August 2010

world underwater film festivalFor those who like to explore the remote and underwater worlds, the Cairns Underwater Film Festival brings 8 awarded films from various nations and a selection of short movies from local talent to the big screen, with over 2 hours of entertainment at the Cairns Civic Theatre.

This year will see the screening of the Winners of the 36th World Festival of Underwater Films direct from Marseille, France. Considered as the benchmark of underwater films, the International Festival in Marseille, France attracts more than 25 000 general public visitors during 4 days of exhibitions and viewings and includes 900 competitors from over 50 nations. It is the most prestigious celebration of underwater art, movies, videos, photos, slideshows, music, paintings, drawings, books etc….

The full Cairns Festival program includes 8 short & medium length award winning movies from 6 different nations as well as 3 local Far North Qld producers, plus the general public’s favourite “Moken, Enigmatic Sea Nomads” a 50 minutes rarely seen documentary on one of the last surviving sea tribes in Burma.

The Winners of the Cairns Underwater Photo Competition will also be announced on Saturday night, August 7.

The show will run for over 2 hours (including a 20 min intermission).

Venue: Cairns Civic Theatre, Florence Street
Date: Saturday 7 & Sunday 8 August 2010 at 7:30 pm
Price: Adults $25, Children $12.5, Family (2 adult & 2 kids) $60, Pension $20

Booking recommended with TicketLink (1 300 855 835), www.ticketlink.com.au

Video: Anemone Shrimp (Periclimenes Holthuisi)

Finally managed to get some video of Anemone Shrimp (Periclimenes Holthuisi). There are a reasonable number of anemones at the local reefs that host shrimp, but diving with groups often makes it difficult to stop and find them.

The visibility was a little low the other day when diving at Agincourt Reef with Quicksilver’s Silversonic . The boat dropped us off at the end of the reef for a drift dive, and I noticed a coral trout at 15m sitting over an anemone on the sandy bottom with his mouth open.


Anemone Shrimp (Periclimenes Holthuisi) – Viewable on Vimeo or Youtube.

I descended down with the aim of getting a photo of the coral trout, but it swam off when I got close. I looked down and noticed the anemone was loaded with anemone shrimp. Most times you will only see one or two shrimp, but this one was loaded with more than twenty. It was obviously a cleaning station, but at the time this did not register with me.

It is a great lesson in the more you know and understand a subject, the better you can anticipate events, the better experience you will have, and the more you will see.  I will be keeping a lookout for more of these in the future.