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albert kok

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Everything posted by albert kok

  1. Hi I just finished an E-book, under the title 'Under Water: Notes and Observations from the World under the Waterline'. Its a 'put together' of all the notes I wrote in my Blog section in the last year. If you are interested in a copy, send me an Email, and I'll send you in return the PDF file as enclosure. Best, Albert
  2. They charge you a small amount per month.. I am happy with them so far.. ..better check with them directly Cheers
  3. Its good to hear that the program is improving. And taken technically, their material is good. But I cant help associating Discovery Channel with a tendency to emphasize the dangerous side of wildlife, great predators in particular. How different is the series Spring Watch from the BBC, which is a real delight to watch!
  4. Agree. It took some time to get the gold fish accustomed to the GOPRO on a tripod, But finally they took the bait and lost their scruples. And there are definite similarities in feeding behavior. Which may help to view sharks from a more realistic perspective and tone down the sensation aspect (-; Cheers Albert
  5. For more details of our trip, have a look at the latest issue of Peter Rowlands Magazine, pages 75-78 http://www.uwpmag.com/
  6. Here a great surface shot of some happy Oceanics (for comparison) taken bij Debra Canabal.!
  7. This is a fun VIMEO clip. Showing some similarity between domesticated tiny creatures like gold fish and apex predators in the Ocean.The behavior of gold fish, hand fed in the small pool on our balcony, reminded me of the baiting of Oceanic sharks from Cat Island Bahamas. Although they do not have that big dorsal fin cutting the surface. The biggest orange gold fish, showing up in the right corner must be around 20 years old. The whitish one,should be 15 years old.
  8. Even with a fish eye lense a snoot can be helpful to lighten up a colourful object on the foreground without disturbing the natural lighting of the background. In this indoor test I used a self made 15 cm long snoot with a front opening of 5 cm made of plastic piping. The snoot was placed on an Ikelite DS 125 strobe set at the lowest intensity. Pictures were taken with the Olympus EPL5 and the Panasonic 8mm fish eye. Single strobe at the left upper corner at a 40 cm distance, ISO 250, shutter speed 1/125, @ f5.6. The three pictures below show the shots without and with strobe, and the snoot on the strobe respectively. Notice that the lighting of the underexposed background is not affected by the snooted strobe. Meaning that this might also work in UW settings like caverns, when you want to add some extra colour like the branche of a sea fan or so, without spoiling the nice natural lighting of the interior.
  9. Hi guys This week end I was happy to welcome my 15.000th visitor. The Frontpage, Sharks and Blog sections jumped out as highest. Thanks to you all and and stay posted!
  10. Thie is a follow up of my (too) optimistic March 5 posting. Unfortunately I did not succeed in making the mini LED trigger from Hedwig work. The trigger fits op top of the Nikon in the Ikelite DSLR housing, which is nice. But It just wont fire my Ikelite D125 strobes (even equipped with the new optic adapters). I also tried the Inon cables. Same story. Its just the LED ouput that seems to be to weak to trigger the strobes.
  11. Just returned from the Bahamas where we did Bimini and Cat island in succession. Luckily there were stil some 'hammies' left at Bimini and the end of the season. The Oceanics of Cat island were an amazing experience. But shooting them is pretty difficult, since you are hanging in the blue and miss the nice sandy floor of Bimini to kneel on. Here a stills sequence of a shark feed by Neil Watson at Bimini: 9 shots taken in 4 secs with the D7200 and Tokina 10-17. The shark making almost a full turn. see further https://www.flickr.com/photos/fttpwwwflickrcomalbert/?saved=1
  12. Actually the content of the Blogs changes regularly, Now the focus is on the Sperm Whales head. http://www.albertkokuw.nl/424978583
  13. Hi, picking up the threads again after almost two years. I finally got myself the mini flat LED trigger from Hedwig Dieraert in Belgium that fits on the hotshoe of my Nikon D7200 (see pic1, my version has four LEDs). Even better, it also fits in the Ikellte housing that comes with this camera. There is not much space left on top of the housing, just enough. If you wish you can still file off a bit of the two little metal spacers connecting upper and lower green parts of the trigger. To make this set up work you need two additional adaptations. First, the Ikelite 4402 strobe mount kit to attach your fiber optical cables to the front of the Ike housing. There is a narrow rectilineair window just behind the Ikelite sticker that you can use to attach the mount kit after removal of the sticker. Be sure that the four LEDs are lined up with, and close to that window (pics 2 and 3). I think that this might work with most strobes that accept optical signals. For the Ikelite DS strobes that are still electrically triggered you will need the new Ike 4401.1 optical adapters that also work with lower intensity LED signals. IF I can get this set up working, I have the nice choice between two options: electrical or optical triggerig. So, if electrical breaks down due to a short or whatever, I can switch to optical (and vice versa) between dives. So you allways have a back up lighting system (-;. I'll keep you informed of future tests in a submersed environment.
  14. I agree with almost everything said above. There are no 'ever' lasting housings. "Ever' means two perhaps three or four years. Then you cant resist buying that new ergonomically superb housing or that new camera that beats all earlier versions in megapixels or focusing speed. For me the lense and camera combo comes first. Personally I am happy with the 'good old' Ikelite housing series for the dSLR cameras. Price is reasonable. Not so difficult to sell if you want to upgrade. I could even keep the same housing while upgrading from D7100 to D7200 (albeit without TTL). The Ike strobes,even the older generation DS 125, are still doing fine. I can even use them with my Olympus 4/3 back up system adding the optical adapters.
  15. Thanks Peter, I just updated my Biology blog with a short article on the hazards of free diving. And for this week I have a nice picture taken by Alan Egan of a Great Hammerhead from Jupiter to share on the frontpage. Cheers http://www.albertkokuw.nl/424978583
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