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r4e

Member Since 16 Jan 2011
Offline Last Active Aug 09 2017 11:52 PM
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Posts I've Made

In Topic: Taking the housing as carry-on

09 August 2017 - 11:53 PM

One of my customers did not remove the O-ring before flying and he then wondered why the back window had popped out during flight. Luckily it had. Because there is the risk that the normal pressurized air would just leak out into the underpressurized cabin. On landing, you would then end up with a slight vacuum inside the housing. Without a vacuum valve, you might try to release the vacuum by opening one of the spare bulkheads, if any.


In Topic: Panasonic LUMIX GH5 for underwater video

18 June 2017 - 06:33 AM

Disclaimer: I have no experience of the IBIS in the GH5.

 

However, my former Sony MC50 video camera had an OIS that was able to lessen, but not completely eliminate, the slight swaying caused by fin action whilst shooting video and swimming at the same time. The Sony had couple of settings for the OIS and I shot test videos with various settings before I selected the setting that best matched my swimming style. I once forgot the recording on after a dive and got wonderful footage of the camera being handed over to the boat and then thrown under a bench. Thereafter the OIS kept compensating the rolling motion of the boat.

 

PS. you can also lessen the swaying motion by performing much smaller fin strokes, e.g. modified frog or flutter kick.


In Topic: Aquatica AD500 flash trigger not triggering strobes

17 March 2017 - 07:00 AM

The optical sensor of the Sea&Sea strobes is known to have had sensitivity issues with various electronic trigger boards from different brands. You should try to maximize the trigger light emited to the optical cable, If there are small reflectors in the housing, try turning them into a position which gives the most direct mirrored route of the trigger light. Additionally you could line the top inside of the housing by some tin foil. This helped in one case.


In Topic: Strobes firing on their own

17 March 2017 - 06:47 AM

I guess you are using an Ikelite Y cable to connect from a single Ikelite bulkhead on your Aquatica housing to your dual strobes. A faulty Y cable or bad connection from it to the bulkhead connector could cause simultaneous trouble to both strobes.

 

The next suspect is the internal cabling and bad connections. If the internal cables from bulkhead and hot shoe are connected to a small circuit board via pin-like connectors, try removing and reinserting the connectors. If there are DIP switches on the circuit board, carefully make a note of their positions and thereafter switch them couple of times back-and-forth before restoring them to their initial positions. You can check the (service) manual for the right positions of the DIP switches.

 

Are you using the new Ike TTL circuitry in your Aquatica housing? Perhaps that is misbehaving? If you still have the internal cabling from an earlier housing, you could try direct internal connection from strobe bulkheads to flash shoe.


In Topic: Just getting started...how am I doing?

01 March 2017 - 02:19 AM

If you plan shooting near the maximum depth ratings (of domes), using a vacuum valve system  has its benefits and drawbacks.

 

A vacuum valve will improve O ring sealing on the surface and very shallow waters (less than deco depths). It also will help you to avoid some common user mistakes and might provide some "peace of mind".

 

However, for maximum depths, the partial vacuum (0.2-0.5 bars) will increase the pressure differential and consequently decrease the nominal maximum depth by as much. In other words, the dome might implode 6-15 feet shallower than it otherwise would. Secondly, the valve is yet another protrusion on your housing and thus slightly increases risk of line entanglement etc. Additionally, the valve itself is an additional leak point. If you do not close the valve fully, it might be airtight at the surface, but still leak at maximum depths. Finally, should your vacuum circuit alarm whilst at bottom, apart from turning the housing to face downwards, there is not much what you can do until returning to surface. With one or multiple hour deco obligations you can only listen to the continuous alarm and watch as the dome fills with water. Sending the camera with a SMB to surface has its own risks, multiple risks.