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Phil Rudin

Member Since 25 Jan 2005
Offline Last Active Today, 02:39 PM

Topics I've Started

Cristian Dimitrius March 10th Presenter

Today, 01:15 PM

Open to all, go to SFUPS.org for details and directions to the venue.



Frazier Nivens November Featured Presenter

04 November 2014 - 12:46 PM

All are welcome, go to the SFUPS.com web sire for location and directions.

New equipment reviews for Ikelite and FIX

01 November 2014 - 09:15 AM

New reviews just released at uwpmag.com Download the free PDF for both complete article.

September featured presenter-Christian Vizl

08 September 2014 - 08:52 AM

SFUPS Club Members:


CHRISTIAN VIZL was born in México City in 1972. Has a degree in Business Administration, was formed as a Diving Instructor, Cave Diver, Rafting Guide, and Sailor. Was a member of CEDAM, a Mexican organization devoted to marine archaeology. Lived for a year in Germany (1993) a year in Akumal, southeast México (1997) and a year in Australia (1998). He has been an enthusiast photographer since the age of 15 but stared underwater photography in 2010 with a more professional approach.

Christian says: "Photography is all about light, and in my opinion, it is the single most important aspect when it comes to creating appealing, inspiring and touching images. In my point of view, far beyond tech- nical issues, what ́s most important is how I apply and manipulate the light that ́s available in order to create pictures with dramatic effect, carrying depths of emotion and using contrast and tonalities as means to emphasize form and structure of the scenery. I focus on the emo- tional impact of the final shot that will connect on a deeper level, with the people that observe these photographs. Just as a poet uses words to create poetry, a photographer uses light to create images. So when Im underwater taking pictures, one of my goals is to create poetic im- ages through the use of light."

Christian is a Published photographer in various magazines and newspapers, such as Ocean Geographic, Scuba Diving, Sport Diver, Asian Diver, Scuba Diving and the Undersea Journal, Alert Diver, Scuba Diver Through The Lens, Dive Photo Guide, Plongee, Tauchen, Apnea, México Desconocido, The Times (UK), Daily Mail (UK), and others. 


Everyone is welcome to attend, see the attached website for directions to the venue. 

Olympus 12-40 F/2.8 and the Zen Underwater DP 170 n85 port

04 July 2014 - 09:55 AM

Not many images have been posted using the New Olympus "pro" 12-40mm F/2.8 lens. This is an excellent lens with a high degree of weather sealing and freeze proofing. A very highly regarded lens with most of the top sites reviewing lenses above water.


I used this lens in the water for the first time yesterday and have attached some images shooting the lens with the Zen Underwater DP 170 n85 optical glass dome port for Nauticam Mini housings. Be aware that Zen has two DP 170 domes with the Nauticam mini mount, the send on is the DP 170 n120.

The difference is the the new n85 model has 25mm's of extension built into the port. The n120 can mount directly to the housing or can be used with a number of extensions depending on your camera system and lens.


The 12-40 zoom is big and needs to be installed to the camera from the front of the housing after the camera has been installed into the housing. The dome in then installed over the lens and secured to the housing. Once in place the vacuum system assures a proper seal on the dome to the housing.


I shot the lens mostly at wide F/stops to see how well the lens works in the wider aperture range. I also attached an over/under shot so you can get an idea of how the dome handles that task.


Over/under 12mm, ISO100, F/6.3, 1/320th.


Octo, 12mm, ISO100, F/7.1, 1/320th.


Octo vertical, 40mm, ISO100, F/5.0, 1/320th.


Octo underside, 40mm, ISI100, F/5.0, 1/320th.


Star, 40mm, ISO100, F/2.8, 1/320th.


100% star detail.


All are full frame, no crop, using two Inon Z-240 strobes attached to the balls on the grips (no strobe arms used.