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albert kok

Member Since 02 Sep 2006
Offline Last Active Feb 04 2016 09:55 AM
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Topics I've Started

new website

08 January 2016 - 11:19 AM

Hi 

Because I had nothing better to do, I started  a website some months ago.

Primarily  to present my UW photo albums. But later I thought that it might also be a good idea  to present some  information and personal  views about the UW photography world, collected from various media and persons.These sections are mostly 'eclectic' that is,  based on pictures, ideas, notes or articles from eminent photographers that I found interesting  or useful, I also tried to keep things simple, and not to get  lnvolved in too technical issues, or  to get lost in the labyrinth of ever changing UW photography hardware So long, I am happy with the numbers of visitors, but you would also do me a  favour to give me your  ‘likes’ Thanks!

see: www.albertkokuw.nl


Comparing Pana 8mm 3.5f and Oly 8mm 1.8f (1)

24 September 2015 - 05:57 AM

Just received the new Olympus 8mm 1.8F FE. The  lense (which is 28 mm longer that the Panasonic 8mm 3.5 F) seems to fit nicely in my  PEN PT EP10 housing with a Zen 25 mm extension ring and the  4 inch dome (EPL5 inside). The position in the dome looks about the same as with the Pana. Without the extension I use the Panasonic 8mm 3.5 F like I did before. Sofar the topside pictures taken with these two set ups (Oly with extension and Pana without) look not so much different.Nice and crisp.


selling Panasonic Lumix 8mm

18 September 2015 - 01:00 PM

Selling Panasonic Lumix 3.5F  8mm fish eye, mint condition, 450 US dollars (400Euro) .Payment by Paypall

Amsterdam The Netherlands. Shipping costs around 25 US dollars. Please send a PM if interested


Using a mini-altimeter as a leak detector

07 May 2015 - 10:04 AM

Commercial  leak-detectors are based on the principle  that a barometric underpressure (or: partial vacuüm) that is sucked in your housing with a hand pump, rises above a critical  level. In that case a red LED on the detector starts blinking: probably a leak!  If you  already have a vacuüm pump, but no detector, a  mini  altimeter (basically a small barometer translating mbars in feets of altitude) can  be very helpful. At least if you a have a transparent  Ikelite housing. I use this little and  cheap  device ALTIMER ONE that I stick  to the inside of the  Ikelite housing. After  the vacuüm is established  (around 20 strokes) you read out the pressure in feets altitude (say 4000 fts). Giving you an objective indication of the pressure inside your housing. So you want to be sure that this reading doesnt change, say in the next couple of hours.

 

I haven't  yet checked  the altimeter reading  during a dive. Its possible that the air pressure  inside the housing may drop a bit, because of the decrease of water temperature (and  cooler air inside the housing) with increasing depth. This will give  you a higher reading on the altimeter. No reason to panic. Only a sudden lower reading on the altimeter means trouble. Apparently water is entering the housing, which  causes  a rise of  the inside pressure  Have fun!.


Wanted: Nauticam Optical 0.66x Viewfinder

03 May 2015 - 01:16 AM

Send me an Email: albertkok69@gmail.com if you have this   finder for sale

Cheers