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String

Member Since 24 Feb 2009
Offline Last Active Yesterday, 09:44 AM
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Posts I've Made

In Topic: Do Strobes and Video Lights Negatively Impact Sea Life

09 May 2019 - 09:19 PM

In Koh Tao (not sure about the rest of Thailand though) there is a restriction of 5-6m away from whale sharks when using strobes. Makes sense, but again, has anyone done a research on that or just a random distance proposal?[/quote]

 

Its just random.  I think the guidance is generally no people within a certain distance full stop.

 

I guess Khao Tao (and elsewhere) there biggest group you want to keep away are the 40+ barely swimming idiots with massive selfie sticks and those seeking to stroke the thing.

 

5-6m obviously means no strobes at all.  It also means no useful photo even without strobes.  Its not based on any science or research at all.


In Topic: Nauticam Vacuum valve - how much vacuum?

01 April 2019 - 08:36 PM

A few observations with mine.

I often prepare in a 20c room then dive in water 28 to 31c after that.
I also sometimes have the housing (accidentally) in direct sun in the tropics.
I've never had the vacuum fail or a warning when going to or from these environments.

It is very sensitive though. It picked up a hair on an O ring in about 20 mins and triggered after a few hours when my electrically connected ikelite strobe minus the battery (which was charging) created a tiny leak path through the cable and strobe.

So I think the circuit may well be temperature compensated or similar. It seems to behave with environmental changes but still very sensitive to actual leaks.

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In Topic: Strobe Advice

01 April 2019 - 08:28 PM



Hi Caroline
 
I don't think anyone has reported reliability problems with the new Z330.


A work colleague of mine had one die after 20 dives 2 weeks. Just refuses to fire but looks like it is (charging whine, LEDs etc)

I think his replacement when he eventually sourced one is ok.

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In Topic: Video lights - cheap(ish)?

01 April 2019 - 08:24 PM

Slight not so good update?
The V6K has died after a few months.
It went off mid dive (on the lowest variable power).
Battery is fine, charger is fine. Turning it on the button LED comes on but the light doesn't. Pressing to select the power gives the usual green light around the button but no light emerges from the head.
So sadly I've had to take it back to KL who then send it away to the manufacturer to see if it's a warranty item out not. Which means no video for the remainder of the dive season here.
I know random failures can happen to any device but it's disappointing none-the-less. I'm hoping they honour the warranty at it's only about 4 months old (and not flooded etc).


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In Topic: Do Strobes and Video Lights Negatively Impact Sea Life

28 January 2019 - 07:13 PM

Was just about to post this but got beaten to it.  Its a limited study (seahorses only) but does dispel a lot of the myths surrounding it and the non-scientific approach to lighting bans.

 

It does tend to support my theory that a lot of the bans (such as Malapascua Thresher Shark dives) have no basis in real world fact or science and are simply made up.

 

Ive been looking (without success) to find any research providing justification for the Malapascua ban (and the unofficial Mola limitations imposed by dive centres in Lembongan etc).