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Member Since 01 Apr 2002
Offline Last Active Yesterday, 09:21 AM

Posts I've Made

In Topic: 3D printed material in seawater

26 July 2016 - 08:53 AM

PLA is used medically for time released drug delivery since it dissolves over time. Use ABS or something like polycarbonate.


In Topic: Inon S2000 for wide angle

26 July 2016 - 08:50 AM

Think about strobes for WA. The S2000 has a GN of about 20 and the YSD2 has a GN of 32. This sounds like a lot but in reality it is only one stop or so. NO strobes can light up a reef or a whale shark and any strobe can give you good CFWA stuff. WA photos are really about natural light and getting your composition correct.


For the s2000 with a GN of 20 (in air) or say 7 in water this means that 

GN = Distance (meters) * f stop

so 7 = distance (meters) * 11 (for f/11) so we can light up something about 2 feet (0.63 meters) or so away 

with the D2 and a water GN of 11 we can light up the same thing one meter away at f/11

so the D2 is only good for an additional foot of distance.


Hope this helps



In Topic: OMD EM5 Inon Strobe HELP!!!

09 July 2016 - 08:59 AM

It looks like you are not getting any strobe light to the subject. With the same camera and strobes I shoot at 1/250 shutter, f:11 or f:16 and the strobes on manual (with magnets in). If you turn off your strobes I think you will get the same photos, but this can easily be checked at home on the kitchen table. With strobes off photos should be mostly just black, with strobes on they should be well lit.


In Topic: Backscatter Airlock replacement gauge and pump?

05 July 2016 - 08:06 AM

I am sure you can get a spare from Backscatter. Otherwise making your own shouldn't be too hard. Vacuum gauges are $10 from McMaster the rest is just finding the correct plumbing. 


In Topic: Inon Z240 cannot "see" red light signal from Nauticam LED flash trigger?

21 June 2016 - 07:36 AM

I don't think that there is a big difference between single and multi-core fibers if the NA is the same. High NA is the key to good triggering.