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albert kok

Member Since 02 Sep 2006
Offline Last Active Sep 28 2015 09:47 AM

Topics I've Started

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


What can WIFI do for the UW Photographer?

20 April 2015 - 09:13 AM

Some new SLR camera's have built in WIFI, combined with NFC (Near Field Communication). I tried it out with  the Nikon D7200 connected with a Nexus (Android) tablet. It seems to work fine on land. You can trigger your camera with your tablet  via remote control, and look at the screen of your tablet for the result. Also, you can inspect the content of your SD card  and then dowload it to your tablet. That could be an advantage  when the camera is still in your housing and you dont want to remove the card. But then you would still depend on a WIFI network. That  may not always be available on your diving trip, like on a live aboard.Can anyone think of a useful application of this WIFI option?