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Member Since 20 Jan 2004
Offline Last Active Today, 01:27 PM

Topics I've Started

Zeiss Otus APO Distagon 55mm f/1.4 manual lens

30 April 2015 - 11:34 PM

I have this lens; incredible beast topside! Anybody out there who tried it underwater?

closest focusing distance is 50 cm and thus probably would require a +2 or +4 closeup lens when shooting behind a dome port. Or with a flat port?


thanks for sharing!

Cat Island (Bahamas): seeking advice

30 April 2015 - 11:28 PM


Going to Bahamas very soon and thus seeking advice from experienced divers/uw-photographers who were actually there already for Cat Island shooting the oceanic whitetips. What lenses did you use or recommend? I habe both the 16-35 f/4 VR and 15mm Sigma on 9" dome port, shooting full frame.



fogging dome port and lens while video recording

02 September 2014 - 12:37 AM

Have been in Cocos recently and never before had a problem like this:


when recording video after some minutes I got a fogging lens and/or dome port inside. This behavior did not occur when shooting stills. Nikon DSLR in a Subal aluminum housing with a 9 inch dome port.


I guess this has a lot to do with the humidity of the environment. as a matter of fact it was very rainy in Cocos all the times and thus very humid. I always prepared the housing on the sun-covered camera deck of the boat (Sea hunter) but leaving the housing sometimes open during the night (covered with just a towel). So by this I guess it accumulated humidity from the air and when recording underwater the upheating of the camera created the fogging.


Any other ideas or experiences like that? Am I right with my assumptions? Should I have always prepared the camera in an AC-controlled environment like inside the ship?


exposure impact on ISO variation

11 July 2014 - 05:03 PM

maybe not such a trivial question, but I am unsure about the following:


it is common knowledge especially in underwater shooting (all manual, no such thing like TTL) that the flash exposure at a given flash strengths is controlled by the aperture and thus affecting the foreground, while the ambient light (background, environment) is controlled by the shutter speed.


If I have a setting to start e.g. f8 and 1/125 sec at ISO 100 and by this my foreground is well exposed but the background is too dark, then I could go to 1/60 sec. If for some reasons I do not want to change the shutter speed but want to increase the ISO from 100 to 200 would that change my ambient exposure of the background AND also my flash exposure of the foreground? Or only the background by 1 full stop? or both by half a stop?


It is clear to me that exposing without flash a f8 1/125s at ISO 100 configuration would yield the same as f11 1/125s at ISO 200 or f8 1/250s at ISO 200 (that is a 1 stop difference each). This is not regarding DOF by the changing aperture or freezing effects by the changing shutter speed, just for the exposure value.


But how is it with the flash?



other example:

let's assume I have a good exposure for background and foreground with settings like f8 1/125s at ISO 200 with a half power of the flash. What is the aperture and shutter speed if ISO is changed to 100 (same flash power) which gives me the same overall exposure than in the beginning?


thanks for enlightenment! 

Nikon D4s and Subal ND4

30 June 2014 - 06:50 AM

By the way....


Nikon D4s fits perfectly into existing Subal ND4 housing (the housing for the older Nikon D4), needs no upgrade. I have tried it!