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albert kok

Member Since 02 Sep 2006
Offline Last Active Today, 09:53 AM
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Posts I've Made

In Topic: Red Sea St. John's

15 October 2014 - 07:14 AM

The dolphins  are superb!


In Topic: What the F-stop

01 October 2014 - 10:52 PM

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.
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In Topic: Port available for the Olympus 12-40?

28 September 2014 - 12:03 AM

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!


In Topic: Port available for the Olympus 12-40?

27 September 2014 - 01:37 AM

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...


In Topic: Port available for the Olympus 12-40?

26 September 2014 - 07:39 AM

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.