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albert kok

Member Since 02 Sep 2006
Offline Last Active Yesterday, 06:16 AM
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#353587 Acrylic Dome Port Scratches Repair

Posted by albert kok on 22 October 2014 - 10:20 AM

Brasso, a metal polisher can also  be very helpful.

http://en.wikipedia.org/wiki/Brasso


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#351689 Personal Chumming Device (PCD)

Posted by albert kok on 18 August 2014 - 04:18 AM

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.Personal Chumming Device (PCD).jpg




#339454 Fish eyes compared: Tokina versus Panasonic (test 2)

Posted by albert kok on 14 November 2013 - 09:34 AM



I think you might have something else going on with your Tok 10-17 -- it just doesn't look sharp in any part of the image.  If it was just a Fine Tuning issue, it would be back or front focusing, but it just looks very "soft" overall. 

Yes tnks,  I noticed that too. Could it also be a camera problem..like a wrong  AF setting, didnt try the fine tuning yet.

 

Today we had sunshine! So I tried some more tests, with Tok and Pana set at 1/30 F8 ISO400, 20 cm distance. Tok now at 10 mm. Results looked better now for Tok/Nikon. So perhaps AF under low ambient light could have produced bad results for the Tok/Nikon combo in the earlier shots. But taken together, and admitting that  this was  probably not the best test of the quality of these lenses, I would tentatively call the Pana fisheye the winner (with a small margin). 

tok230F8ISO400.jpg pana230F8ISO400.jpg