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Member Since 29 Dec 2001
Offline Last Active Apr 14 2014 07:18 PM

Posts I've Made

In Topic: Sigma 15mm fisheye focus problem

19 March 2014 - 08:36 PM

I think you need the extension if you're not getting focus. Even with it you'll have corner issues with that small a port. But for video it should be ok, especially if you stop down.



In Topic: Mini Dome vs Larger (8") dome

17 March 2014 - 11:21 AM

I would also take into consideration that I showed you shots taken with a full-frame camera vs. a crop sensor on the mini-dome. Not sure what you are shooting.

In Topic: Nikon 17-35mm on D800 with Zen 230mm dome - diopter needed?

16 March 2014 - 12:38 PM

Yes, just didn't focus well in lower light levels for me.


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In Topic: Mini Dome vs Larger (8") dome

16 March 2014 - 10:40 AM

Generally a small dome can work quite well, particularly for CF/WA as you stated. You do have to stop down to f/8 or higher. While it's never going to have the image quality in the corners of the shots that the large domes have, results can be quite good.


Larger domes are better overall, but work particularly better at more wide open apertures, and excel at over & unders, something that small domes don't do well at all.


There is also medium-sized domes such as the Zen 170mm, which offer a very good compromise, as they are a section of the larger 8.5" curvature of the larger domes. They still work better stopped down, and aren't quite as good as a larger doem for over & unders though. But they offer the ability to do quite good CF/WA, particularly with FE lenses.


Here's a few examples:


9" glass dome (D800 w/Sigma 15FE):

Manta by Optical Ocean, on Flickr


8.5" Acrylic dome (D7000 Tokina 10-17):

DSC_3616.jpg by Optical Ocean, on Flickr


Zen DP170 170mm dome, (D7000 Tokina 10-17):

Soft Coral at Surface.2 by Optical Ocean, on Flickr


Zen DP100 100mm dome, (D7000 Tokina 10-17+Kenko 1.4TC):

Tomato Anemonefish w/a by Optical Ocean, on Flickr


Hope that helps!


In Topic: Your Favourite/Best Image of 2013

30 December 2013 - 11:14 PM

Manta off El Boiler, San Benedicto Island, MX. Nauticam D800, Zen 230, Sigma 15, 2x YS D1 strobes.
Attached File  Manta.jpg   209.87KB   37 downloads


Styles Tunnel, Palau. Nauticam D800, Zen 170, Sigma 15. Available light (ISO 2500)

Attached File  Styles Tunnel.jpg   146.7KB   47 downloads


Best wishes to everyone for 2014!