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albert kok

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Everything posted by albert kok

  1. Here is recent shot taken on Bimini with the same Oly/Pan combo, natural light and filter. Nice colours I think. But details of the sharks head would probably have been sharper with a flash. The head of the shark moved pretty fast.. https://www.flickr.com/photos/fttpwwwflickrcomalbert/15889550904/
  2. What a coincidence! Great spot dont you think? Cheers Al
  3. Athough the Bahamas lack the splendid colourful reefs of the Indian Ocean and the Red Sea, they do have one big promise for the UW photographer: an abundance of big sharks. Moreover, thanks to responsible baiting of sharks it is possible to encounter in the Bahamas almost any type of shark on a specific location. This means that the chances of actually meeting a bull, tiger or even the miraculous great hammerhead on your trip have become better and better in recent years. Last week I had the opportunity to visit the great hammerhead on Bimini. A shark that I had missed on my earlier trips to Tiger Beach, which is not so far from Bimini. The organiser Neil Watson Jr. and his team take very well care of the sharks as well as their visitors. Apart from some variation in the weather, diving conditions were excellent. I'm therefore glad to post here a link to some recent pictures of the GHH from last weeks visit. https://www.flickr.com/photos/fttpwwwflickrcomalbert/sets/72157650228222856/
  4. nice picture and composition but (sorry) the seahorse (its head in particular) seems to be a bit out of focus? .
  5. Not quiet similar conditions, but here are some shots taken last week with the Oly/Pan combo and a 4 mm Precision dome in the Red Sea. No sharks this time (not with this combo) but some reef scenes. I was rather pleased with the quality of the pictures. With many divers around you are almost certain to get most of them in your image with this super wide lense. So some cropping is unavoidable. But even the cropped versions shown here looked pretty sharp. https://www.flickr.com/photos/fttpwwwflickrcomalbert/15205360024/ https://www.flickr.com/photos/fttpwwwflickrcomalbert/15641378628/ https://www.flickr.com/photos/fttpwwwflickrcomalbert/15641923478/ this was taken with natural light and a filter no crop.. https://www.flickr.com/photos/fttpwwwflickrcomalbert/15648469819/
  6. So I meant to say that not only scratches but also dust particles floating in front of the mini dome may deceive the autofocus system. Especially when a lot of sunshine penetrates into the water.
  7. When an acrlylic mini dome contains small scratches or dust particles, the autofocus of the camera sometimes mistakes them for subjects further away you are trying to shoot. I think this is more likely when bright sunshine hits the dome.But the primary reason is that a fish-eye lens behind a mini dome is able to focus on minuscule objects that are very close to the front of dome, or even on the dome itself. .See what happened to me with the Tokina 10-17 behind a 5 inch Precision dome. The 100% crop shows that the lens was just doing its job: focusing on dome scratches and small dirt particles floating in front of the dome.
  8. Brasso, a metal polisher can also be very helpful. http://en.wikipedia.org/wiki/Brasso
  9. I think that the benefits of a faster lens and better optics will not only show up with portrait-length perspectives and large apertures. They'll also show up for wide-angle pespectives and smaller apertures. .
  10. Kevin thanks for your advice. To summarise: the ZEN 100 EP dome port plus Zen 25 mm extension for the Pen housing might after all be the best option for the Pen/12/40 combo. Its wide and long enough; it might even enable the use of the 40 mm zoom. The only problem remains the zoom ring.Maybe two available rings are worth trying: the Oly PPZR EP-04 and the Nauticam 01240Z, both working with the 12-40 but probably too wide for the internal 70mm diameter of the ZEN port plus extension. So you have to bring down the outer diameter to around 65/68 mm by shaving of some of the outer surface of the Oly ring. Even better perhaps would be to construct a new plastic Zoom clamp. Like Ikelite uses for the DSLR camera's (made from very thin plastic of only 1 mm). Any comment is welcome!
  11. Hi, Im sort of mixed up with al these Zens. Is that the ZEN WA 100 EP? Does 100 stand for 100mm= 10 cm= 4 inch? It could work with the EP PT10/12-40 lens. The Zen 100 EP is pretty long, which is nice. The 5 mm clearance would probably be just enough to accomodate a very thin plastic zoom ring. Like the clamp plus sleeve system Ikelite uses. Finding the right extension would be the next step, preferably with the same diameter as the port with bayonet style connection...
  12. Tnks Phil. That was the wrong Athena link I meant www.athena-opt.com/english/img/PT-EP05L_06L-2013-01-24.pdf same as for the PT-EP10 I guess the Zen dome port for the 12-40mm zoom lens ( the DP-170-N85 II you mentioned) is meant for the Nauticam housing? Like the Nauticam 7 " acrylic dome? Anyhow, Ill try to work out some 'homemade' solution for the 12-40 in my Oly PT EP 10 housing. Just for fun. I already have the 8mm Panasonic lens working nicely with the 4 inch Precision dome, so my life doesnt depend on using the 12-40 UW.
  13. Hi Phil. Thanks for your info.Yeah I think that you are right. The Olympus 12-40 zoom ring was made for the PT-EP11 Oly housing with the wider opening. But the Athena adapter plus long extension should work with the PEN housing, according to their port chart. http://www.athena-opt.com/ptep08/images/ptep08.pdf I think their port extensions are also wide enough for the 12-40 lens. If so, then the outer diameter of the Olympus PPZR EP04 zoom ring seems to be only bottleneck. If you could bring it (not the gear) down to 70 mm (or a bit less) it would probably fit in the port extension. Finally I noticed the Aquatica 30506 zoom gear and 30602 extension (58mm long!) for the 12-40 lens...fitting on every MFT housing according to Aquatica. http://www.aquatica.ca/en/charts/43_micro_type_lens_chart.pdf Its pretty complicated stuff: so many models and versions on the market
  14. Hi, after some searching I found out that there is an Oly zoom-ring for the 12-40 lens: the PPZR EP04 that should fit on Oly housings, and sells for 50 dollars at B&H. I further think that any dome that fits on the EP PT10 will work with the Athena port adapter and 22 mm extension ring, made for Oly housings. I also noticed that Athena sells longer port extensions like the EP/30 PTE and EP/46 PTE which may be even more suitable. This means that people who already possess a dome-port for their Oly housing could probably get away with buying just the Oly zoom-ring and Athena adapter plus long extension. And then attach their dome port (Zen or Precision) on the extension ring. But I could be too optimistic.
  15. I have the same question. The 12-40 is a bit too wide to fit in the flat port that comes with the Oly PT-EP10 housings. The length is OK, at least for the widest 12mm zoom setting. And a flat port may not be ideal for this lens. The 4 inch Precision dome (that works fine with the Oly housing and 8 mm fish-eye of Panasonic) has the right diameter, but is much too short for the 12-40. To my knowledge there is also no zoom ring on the market for the 12-40 Oly combo. There is a ring for the smaller 14-42 Oly zoom lens. And there is zoom ring plus extension made by Athena for the Olympus 7-14, that may also work with the 12-40. lens. But then you would stil need a suitable dome lens that fits with the Athena extension. Perhaps the Nauticam 7 " acrylic dome comes closest to what the Oly people need. A long port body with a dome at the end, that will also take zoom gear, unless you are happy to use only the wide 12 mm zoom setting. However, the Nauticam dome is not compatible with the PT-EP10 housing. But its much cheaper than the Zen domes.
  16. Hi Steve I am not promoting anything, just suggesting a device that might work under the right UW conditions, and in the hands of experienced photographers working solo. Havent tried it with sharks (yet )..It did work very well with the groupers. Its like feeding a cookie to a dog. After a couple of dives the groupers will recognise you and will come close, even without the device. Its called 'intermittent reinforcement'. The reinforcer in this case is a weak smell stimulus, not at all like a crate containing loads of dead fish parts. And you can alway hide the bottle under a stone or piece of coral, if you feel uncomfortable with carrying it in your BCD pocket. On the other hand, chumming with bait crates might still be the best and safest method for groups of divers/photographers going out to visit sharks under supervision,
  17. Hi There is a never ending discussion around the topic 'chumming or not chumming'. But we all agree on the issue that chumming should interfere as little as possible with the natural behavior of fish. The simple device I called PCD might be of help to bring fish closer to your camera, without disturbing the environment too much. I used it in the Mediterranean to attract groupers, but I think it might also work with larger predators like sharks. It could be especially useful for the individual diver in conditions when chumming on a larger scale, e.g. on a diving boat, is not allowed or undesirable.
  18. Yes, With Photoshop you could probably get rid of the knees. And..probably also the bikini top? Mermaids dont wear anything (they told me). Please forgive me the joke. Your initiative and collection are just fine! And some people believe mermaids also had knees. See the pic of Kopenhagens mermaid.
  19. I'm sure it meant a lot of work to get the mermaid model in the right position. But for me it was bit odd that you could still see her knees pointing trough the tail. (-:
  20. With an ikelite DSLR housing you cant use fiber optic cables. But you can buy the Ikelite optic converters that transform the electrical sync signal into an optic signal. But only for their DS strobes See also http://www.uwphotographyguide.com/ys110-strobe-review
  21. Hi Mark, yes I know. I have used these electrical sync chords with Ikelite strobes for many years. And the technology behind it is great. But with electrical open water connections you always risk leakage, corrosion, broken pins of connectors etc. Fiber optics just seems to me a more advanced way of using flash underwater. Without loosing TTL (for those who like it), sync speed, and too much battery power. Perhaps the time has come for Ikelite to make a step forward, and bring out a DSLR housing with electrical and optical connections. If they could also keep the price low, it could become be a great succes. Cheers, Al
  22. Ikelite housing for Nikon D7000, 2 j old. Perfect condition 650 Euro, 885 US dollars.
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