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albert kok

Member Since 02 Sep 2006
Offline Last Active Today, 09:38 AM
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Posts I've Made

In Topic: Dome Port Cleaning

Today, 12:43 AM

  sf


In Topic: Dome Port Cleaning

Today, 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


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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