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bvanant

Team Wetpixel
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bvanant last won the day on January 4

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About bvanant

  • Rank
    Sperm Whale
  • Birthday 09/13/1951

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  • Website URL
    http://www.blueviews.net
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Profile Information

  • Gender
    Male
  • Location
    Los Angeles (more or less)
  • Interests
    Science, photography, travel

Additional Info

  • Show Country Flag:
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  • Camera Model & Brand
    Canon 7D
  • Camera Housing
    Subal
  • Strobe/Lighting Model & Brand
    Inon, Sea and Sea, Ikelite
  • Accessories
    ULCS and Hartenberger

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  1. In my computerized discharge tests (designed to mimic the Z240 charging circuit), I see the pro versions have about 23% more capacity (Inon suggest about 33% more) when fully charged. Inon also suggests the pros charge faster but I can't test that easily and you shouldn't count on when the red light goes on on the strobe, it probably is only 80% charged. Bill
  2. Certainly the Nauticam LED trigger is not robust in the sense that you can use it with most flashes but only if you use a multi-core fiber. With multi-core it works with Inon, S&S (D1 and D2J), Kraken, and the new Backscatter mini. Bill
  3. IF each bend is bigger than the minimum bend radius you will not keep getting losses, the overall transmission is what is important. Clearly there is no "information" in the pulse from a flash other than intensity. BUT that being said, if your cable is not optimal it just won't trigger your strobe. I have some single core cables that will trigger a Z240 with ease but will not trigger a YSD1 at all if I am using an LED trigger on the camera. Nothing happens, the strobe just doesn't fire. If I use the same system but with a multi-core fiber then the strobe fires. A lot depends on the sensitivity of the optical probe on the strobe and also on what you are using on the camera. If I use the Olympus flash, then things are good with all types of FO cables, but not so much with the Nauticam LED trigger. I would like to believe that 9% loss is not important for most things, but of course there are all kinds of tolerance stack ups that you need to think about, and in some cases 9% or 10% loss is enough to make things not work. Bill
  4. The minimum bend radius is for something like the Asahi 1 mm fiber is 30 mm which is quite large. For the ESKA single 1 mm fiber it is 5 mm (for a 0.5 dB loss). It is relatively easy to show that the ESKA materials have about a 9% loss on coiling, while the 613 core fibers show less than 1 % (on my homemade coils). I think the point is that if you get a kink in a fiber, the multi-core will survive while the single core won't. A 0.5dB loss means you only get 94.something percent transmission, not that it goes to zero. Bill
  5. In my hands at least, if you are shooting with an onboard flash then single core might be OK. If you are shooting with an LED trigger though, and using S&S strobes, multi-core is the way to go, my single core fibers will not trigger my YSd1 with the Nauticam LED trigger. It is easy and quite cheap to build your own multi-core fibers. If you look at the specs for 1 mm single core fiber its bend radius to get a 0.5 dB loss is like 20 mm while the multi-core stuff Is 1 mm. So a sharp.bend might leave your single core fiber in not so good shape. Bill
  6. For sale is a used Micro 4/3 system based on an Olympus OM-D EM-1, Mark 1 camera and a Nauticam housing. The camera system comes with both the Leica/Panasonic 45 mm macro lens and port as well as the Olympus 14-42 lens (with gear) and the semi-dome Nauticam port for that lens. The EM-1 housing was $1870 new, the camera was $1000. The camera comes with 4 batteries and a dual battery charger. Complete system is $900. A second body is yours for an additional $250. Bill
  7. I am looking for someone to modify an old HD camera housing to allow for putting in a 4k Camera. The camera fits but the software in the housing will need to be updated. Anyone know of a custom shop that could do something like this. thanks Billl
  8. bvanant

    Want to Buy

    looking for a Nauticam OM-D EM-1 Mark II housing. Just the housing, I have ports and arms and mostly everything else. Bill
  9. If you can get to the connectors that go to the LED you could cut one of them? Bill
  10. If you use the multi-core fiber and coil it carefully you will not see any appreciable transmission loss. The multicore fibers have bend radii of 1 mm or so, and no one will try to coil it with that kind of radius. At 1 mm bend the transmission loss of the 613 core fibers is < 0.5 dB or 6 % loss (if I remember how to convert dB to %). If you use the Toslink or other single core fibers then the bend radius (Asahi) is 30 mm for the same 0.5 dB loss so you will definitely see some loss for tightly wound cables. Bill
  11. In general, with optical TTl the camera flash sends out a signal, that sends out a strobe pre-flash. The camera metering system reads that flash and then sends the appropriate length flash to the strobe which fires the same length strobe flash. Some strobes can do TTL via a slave function, a light sensor on the strobe looks at the scene then sets the strobe power (actually pulse length). Here is a good tutorial http://www.inon.jp/technicalguide/sttl-auto.html The TTL board understands the Sony protocols for making flash strength choices and controls a dumb strobe correctly. Unlike film era or electrical sync TTL, of course Optical TTL has only a one-way connection, the strobe can listen to the camera but not talk to it. Bill
  12. The ball end of the Howshot is the same size as most other gear (ULCS, Inon etc.) Most of their stuff is fine, but I don't think there is a US distributor. You should take a look at the Kraken stuff as well, Jack at Optical Ocean sells them and they are pretty inexpensive. Bill
  13. If they are more than 5 years old they are single core fibers. As for ends, if you buy the Divervision ones, you can put any o-ring on them you want, the ones they come with are too tight for me. Bill
  14. or you can make your own multi-core cables as well. Avoid the real cheap AliExpress version ($16). They claim 613 core but my microscope thinks otherwise. Bill
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