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albert kok

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

Posts I've Made

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

25 September 2015 - 06:59 AM

Havent  tried out the lense in open water yet. Like I said, on first sight  I  feel that there  is not SO much difference with my old Panasonic 8mm F 3.5. Here are some preliminary results, Look at the two pics of the plastic bottle  with Oly set at F7.1 and 1.8 in a water tank. Bye..



In Topic: Olympus new lenses 8 mm fisheye considerations weight and so on ...

06 September 2015 - 01:12 PM

I think this new Oly 8mm lense will work with old PEN housings and cameras (like the EPL5). And a 25 mm extension ring. The only problem is the dome. The new Oly  FE lense in 80mm long, the older Lumix 8 mm  lens  is 52 mm long (28 mm difference), This means that  even with the 25 mm extension ring  the front of the Oly  lense will be around 3 mm closer to the dome. Which may cause some corner unsharpness. Cheers Al

In Topic: New Olympus 8mm FE lens

21 August 2015 - 10:17 AM


Hope  this information is useful. What I know about the new  Oly 8mm FE f 1/1.8 lense  sofar is:

-the lense fits on the older PEN housings using the  ZEN  ER-EP25 extension ring and ZEN DP-100-EP   dome lense.

-some top side pictures show excellent performance (e.d. depth of field, corner sharpness) even at the widest aperture.

-some UW pictures taken in darker spaces like caves with natural light looked spectacular to me. Its hard  however  to judge from these pictures technical  details  such as corner sharpness, depth of field, especially at the widest aperture. 

The type of dome lense could be a critical factor here. I believe that the Zen dome worked very well with the older Pana  FE 8 mm f 1/3.5 lense. Not sure if this  holds also  for the  longer  Oly 8mm FE 1/8 lense  with the extension ring.  Possibly some people have the opportunity to run some comparative tests?


In Topic: Red Sea Workshop with Alex Mustard

16 August 2015 - 11:23 AM

Very nice Sunset!

In Topic: Olympus E-M1 & New MZ 8mm Fisheye PRO Lens

16 August 2015 - 12:16 AM


I understand that this new lense will also fit on the older PEN housings using the ZEN 25 mm extension ring and

the 4 inch dome port used for the Lumix  8mm lense?