Jump to content


Member Since 14 Sep 2009
Offline Last Active Today, 02:37 PM

Posts I've Made

In Topic: Leaving the camera at home

10 October 2016 - 02:34 PM

I find the obsession with breaking down housing and camera into component parts for travel really weird. I travel with my DSLR in the housing with the wide angle lens and dome port in situ and strobes attached, ready to dive. Fits in a backpack with a jumper for padding as I casually wander onto the plane pretending it doesn't weigh much. I put fresh eneloops in the strobes at home and setting up consists of:


Step 1. Remove Housing From Backpack

Step 2. Go Diving


I can see why spending the first day of the trip fiddling nervously with o-rings and puffing minuscule bits of dust off the lens/port/lens again would detract from the excitement.

In Topic: Austrailian diving in Feb and March

18 September 2016 - 08:59 PM

It's a big country. How much travelling do you want to do? Late Feb will be mid summer and the warmest water temps of the year. It's also wet season up in Queensland so the vis might not be the best if you stay close to shore. Sydney diving is meant to be nice. In the same state you could visit South West Rocks (Fish Rock Cave with lots of grey nurse sharks), Jervis Bay (big rocky reef scenery) or go north for Coffs Harbour and the Solitary Islands (starting to get tropical life).

In Topic: Strobes - does this exist?

18 September 2016 - 08:36 PM

I'm lucky - I dive with the world's most disciplined buddies. :-)


For reasons of cave conservation though I wouldn't like to consider a cable option. I can't stand scarred cave floors.

You need a bigger tunnel :-) Long cables are better than tripods from a conservation perspective. You could consider laying one along the line during a setup dive and coming back to take the photo later.


The options I outlined require some DIY as they're not commercially available. The other option is to throw a lot of money at the problem - a few 10,000 lumen heads would give you enough power for reasonable pictures dependent on cave size and colour.

In Topic: Strobes - does this exist?

13 September 2016 - 05:10 PM

I forgot the other option - really long strobe cables and well disciplined buddies :)

In Topic: Strobes - does this exist?

13 September 2016 - 04:00 PM


Do these work better than Triggerfish? I love the Triggerfish, but sometimes I want to shoot further than its effective range. I also don't want to light the area around my camera all the time which is what ends up happening if you use the on-camera strobes to fire the off-camera ones.




Liz knows exactly what I'm getting at. :-)

Nope, the RSUs are much worse. The sensitivity/distance is about half that of the triggerfish and if there's too much ambient light they shut down and refuse to trigger anything.


I’ve had discussions with my dive buddy the nuclear physicist, and my Dad’s dive buddy, the guy who built the Challenger Deep sub. Both of them said that trying to change wavelengths from visible light to something else was impractical. The ones I looked at were:

Infrared (used by dry cavers a lot) – attenuation distance in water is about 7cm

Ultraviolet – causes eyeball cancer

Soundwaves – too slow, you’d be looking at shutter speeds of 1/15 or less over 80m distance


The best option I could see would be to introduce a delay in the system somewhere and still use the light as a trigger. For example, press the shutter but the shutter is delayed by half a second while the onboard strobe fires. The off board strobes are all delayed by half a second after they receive the flash. This would probably require some fine tuning (understatement!).