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albert kok

Member Since 02 Sep 2006
Offline Last Active Yesterday, 06:16 AM
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Posts I've Made

In Topic: Fish eyes compared: Tokina versus Panasonic (test 2)

20 November 2014 - 11:56 AM

Not quiet similar conditions, but here are some shots taken last week with the Oly/Pan combo and a 4 inch Precision dome in the Red Sea. No sharks this time (not with this combo) but some reef scenes. I was rather pleased  with the quality of the pictures.  With many divers around you are almost certain to get most of them in your image with this super wide lense. So some cropping is unavoidable. But  even the cropped versions shown here looked pretty sharp.

https://www.flickr.c...rt/15205360024/

https://www.flickr.c...rt/15641378628/

https://www.flickr.c...rt/15641923478/

 

this was taken with natural light and a filter no crop..

https://www.flickr.c...rt/15648469819/


In Topic: Fish eyes compared: Tokina versus Panasonic (test 2)

19 November 2014 - 09:42 AM

Not quiet similar conditions, but here are some shots taken last week with the Oly/Pan combo and a 4 mm Precision dome in the Red Sea. No sharks this time (not with this combo) but some reef scenes. I was rather pleased  with the quality of the pictures.  With many divers around you are almost certain to get most of them in your image with this super wide lense. So some cropping is unavoidable. But  even the cropped versions shown here looked pretty sharp.

https://www.flickr.c...rt/15205360024/

https://www.flickr.c...rt/15641378628/

https://www.flickr.c...rt/15641923478/

 

this was taken with natural light and a filter no crop..

https://www.flickr.c...rt/15648469819/


In Topic: Dome Port Cleaning

25 October 2014 - 12:43 AM

So I meant to say that not only scratches but also dust particles floating in front of the mini dome may deceive the autofocus system. Especially when a lot of sunshine penetrates into the water.


In Topic: Dome Port Cleaning

25 October 2014 - 12:38 AM

When an  acrlylic mini dome contains small scratches or dust particles, the autofocus of the camera sometimes mistakes them for subjects further away you are trying to shoot.  I think this is more likely when bright sunshine hits the dome.But the primary reason is that  a fish-eye lens behind a  mini dome  is able to focus on minuscule objects that are very close to the front of dome, or even on the dome itself. .See what happened to me with  the Tokina 10-17 behind a 5 inch Precision dome. The 100% crop shows that  the lens was just doing its job: focusing on dome scratches and small dirt particles floating  in front of the dome.


In Topic: Acrylic Dome Port Scratches Repair

22 October 2014 - 10:20 AM

Brasso, a metal polisher can also  be very helpful.

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