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Member Since 01 Apr 2002
Offline Last Active Today, 09:29 AM

Posts I've Made

In Topic: Nauticam vacuum error

Today, 08:27 AM

Try disconnecting the battery and reconnect (and be careful on how to put the battery in). Solid red supposedly means a leak, are the prongs of the leak detector side touching or touching the metal?


In Topic: Second thoughts about vacuum systems

Today, 08:25 AM

I am not sure that I agree that "the compressive force of the parts being assembled serves only to approximate the o-ring to the sealing surfaces, but any compressive force generated on the o-ring by assembly is not in the same axis as the sealing force at the o-ring generated by a pressure differential." I assume that without the vacuum system my housing is sealed with minimum pressure delta applied i.e. it will not leak in half an inch of water or if I apply a small overpressure into the housing (like heating it up in the sun) it will not leak even when the Delta P is in the opposite direction.  

We design medical devices that really need to stay sealed and my engineering colleagues suggest to me that sealing, especially sealing with o-rings is not simple and that modeling the whole sealing process is extremely complex.


In Topic: I'm not sure if I should be flattered or annoyed...

07 March 2015 - 11:40 PM

You should be pissed and should ask the "artist" for some share of the royalties that he is getting.


In Topic: Is underwater photography actually possible without a strobe? using the right...

07 March 2015 - 11:34 PM

Yes it can be done, I wrote a short article that is on the Optical Ocean Sales blog site about it. Of course you can do it, using relatively  bright LED lighting but you can't capture action and will have little DOF control. 


In Topic: Flash settings with Olympus E-M1

04 March 2015 - 04:09 PM

I am quite sure that in TTL mode, the S2000 will ignore the magnet, it is only looked at by the strobe when in manual mode, so you can do both. I do occasionally use my EM-1 (with the same two strobes) in fill mode if I am shooting something that is moving and I have only one shot to take it. That being said, the frame rate is really slow 1/64 works for most of what I shoot.